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The Second Bulgarian Empire (; ) was a medieval Bulgarian state that existed between 1185 and 1396. A successor to the First Bulgarian Empire, it reached the peak of its power under Tsars Kaloyan and Ivan Asen II before gradually being conquered by the Ottomans in the late 14th century.

Until 1256, the Second Bulgarian Empire was the dominant power in the Balkans, defeating the Byzantine Empire in several major battles. In 1205, Emperor Kaloyan defeated the newly established Latin Empire in the Battle of Adrianople. His nephew Ivan Asen II defeated the Despotate of Epiros and made Bulgaria a regional power again. During his reign, Bulgaria spread from the Adriatic to the Black Sea and the economy flourished. In the late 13th century, however, the Empire declined under constant invasions by Mongols, Byzantines, Hungarians, and Serbs, as well as internal unrest and revolts. The 14th century saw a temporary recovery and stability, but also the peak of Balkan feudalism as central authorities gradually lost power in many regions. Bulgaria was divided into three parts on the eve of the Ottoman invasion.

Despite strong Byzantine influence, Bulgarian artists and architects created their own distinctive style. In the 14th century, during the period known as the Second Golden Age of Bulgarian culture, literature, art and architecture flourished. The capital city Tarnovo, which was considered a " New Constantinople", became the country's main cultural hub and the centre of the Eastern Orthodox world for contemporary Bulgarians. After the Ottoman conquest, many Bulgarian clerics and scholars emigrated to Serbia, Wallachia, Moldavia, and Russian principalities, where they introduced Bulgarian culture, books, and hesychastic ideas.

Nomenclature

The name most frequently used for the empire by contemporaries was ''Bulgaria'', as the state called itself. During Kaloyan's reign, the state was sometimes known as being of both Bulgarians and Vlachs. Pope Innocent III and other foreigners such as the Latin Emperor Henry mentioned the state as ''Bulgaria'' and the ''Bulgarian Empire'' in official letters.

In modern historiography, the state is called the ''Second Bulgarian Empire'', ''Second Bulgarian Tsardom'', or the ''Second Bulgarian Kingdom'' to distinguish it from the First Bulgarian Empire. An alternative name used in connection with the pre-mid 13th century period is the ''Empire of Vlachs and Bulgarians''; variant names include the ''Vlach–Bulgarian Empire'', the ''Bulgarian–Wallachian Empire'', or the ''Romanian–Bulgarian Empire''; the latter name was used exclusively in Romanian historiography.

However, Arabic chronicles from the 13th century had used only the name of Wallachia instead of Bulgaria and gave the Arabic coordinates of Wallachia and specified that Walachia was named "al-Awalak" and the dwellers "ulaqut" or "ulagh".

Background

In 1018, when the Byzantine emperor Basil II ( 976–1025) conquered the First Bulgarian Empire, he ruled it cautiously. The existing tax system, laws, and the power of low-ranking nobility remained unchanged until his death in 1025. The autocephalous Bulgarian Patriarchate was subordinated to the Ecumenical Patriarch in Constantinople and downgraded to an archbishopric centred in Ohrid, while retaining its autonomy and dioceses. Basil appointed the Bulgarian John I Debranin as its first archbishop, but his successors were Byzantines. The Bulgarian aristocracy and tsar's relatives were given various Byzantine titles and transferred to the Asian parts of the Empire. Despite hardships, the Bulgarian language, literature, and culture survived; surviving period texts refer to and idealize the Bulgarian Empire. Most of the newly conquered territories were included in the themes Bulgaria, Sirmium, and Paristrion.

As the Byzantine Empire declined under Basil's successors, invasions of Pechenegs and rising taxes contributed to increasing discontent, which resulted in several major uprisings in 1040–41, the 1070s, and the 1080s. The initial centre of the resistance was the theme of Bulgaria, in what is now Macedonia, where the massive Uprising of Peter Delyan (1040–41) and the Uprising of Georgi Voiteh (1072) took place. Both were quelled with great difficulty by Byzantine authorities. These were followed by rebellions in Paristrion and Thrace. During the Komnenian Restoration and the temporary stabilisation of the Byzantine Empire in the first half of the 12th century, the Bulgarians were pacified and no major rebellions took place until later in the century.

History

Rebellion

The disastrous rule of the last Komnenian emperor Andronikos I (r. 1183–85) worsened the situation of the Bulgarian peasantry and nobility. The first act of his successor Isaac II Angelos was to impose an extra tax to finance his wedding. In 1185, two aristocrat brothers from Tarnovo, Theodore and Asen, asked the emperor to enlist them into the army and grant them land, but Isaac II declined and slapped Asen across the face. Upon their return to Tarnovo, the brothers commissioned the construction of a church dedicated to Saint Demetrius of Salonica. They showed the populace a celebrated icon of the saint, who they claimed had left Thessalonica to support the Bulgarian cause and called for a rebellion. That act had the desired effect on the religious population, who enthusiastically engaged in a rebellion against the Byzantines. Theodore, the elder brother, was crowned Emperor of Bulgaria under the name Peter IV, after the sainted Peter I (r.927–969). Almost all of Bulgaria to the north of the Balkan Mountains—the region known as Moesia—immediately joined the rebels, who also secured the assistance of the Cumans, a Turkic tribe inhabiting lands north of the Danube river. The Cumans soon became an important part of the Bulgarian army, playing a major role in the successes that followed. As soon as the rebellion broke out, Peter IV attempted to seize the old capital of Preslav but failed; he declared Tarnovo the capital of Bulgaria.

From Moesia, the Bulgarians launched attacks in northern Thrace while the Byzantine army was fighting with the Normans, who had attacked Byzantine possessions in the Western Balkans and sacked Thessalonica, the Empire's second largest city. The Byzantines reacted in mid-1186, when Isaac II organized a campaign to crush the rebellion before it spread further. The Bulgarians had secured the passes but the Byzantine army found its way across the mountains due to a solar eclipse. Once the Byzantines reached the plains, the rebels did not risk a confrontation with the larger, better-organized force. Peter IV pretended he was willing to submit, while Asen travelled to the north of the Danube to raise an army. Contented, the Byzantine emperor burned the Bulgarians' crops and returned to Constantinople. Soon after, Asen crossed back over the Danube with Cuman reinforcements, declaring he would continue the struggle until all Bulgarian lands were liberated. A new Byzantine army was assembled under the command of the emperor's uncle John Doukas Angelos, but as Isaac II feared he would be overthrown, Doukas was replaced by John Kantakouzenos, a blind man ineligible for the throne. The Bulgarians attacked Kantakouzenos' camp during the night, killing a large number of soldiers. In mid-1186, another army under the general Alexios Branas was sent in. However, instead of fighting the rebels, Branas turned to Constantinople to claim the throne for himself; he was murdered shortly afterwards. Taking advantage of the chaos, the Bulgarians raided northern Thrace, looting the countryside before Byzantine forces could counterattack. On one occasion, the two armies confronted each other near the fortress of Lardea in an indecisive battle; the Bulgarians kept their plunder and retreated untroubled to the north of the Balkan mountains.

In the late 1186, Isaac II launched his second campaign against Bulgaria. His army was forced to spend the winter in Sofia, giving the Bulgarians time to prepare for the invasion. Early the following year, the Byzantines besieged Lovech but could not seize it; they signed an armistice that ''de facto'' recognized Bulgarian independence. In 1189, when the leader of the Third Crusade, emperor Frederick I Barbarossa was at the brink of war with the Byzantines, Asen and Peter IV offered him an army of 40,000 in return for official recognition, but relations between the Crusaders and the Byzantines eventually improved. In 1190, Isaac II led another anti-Bulgarian campaign that ended in a catastrophic defeat at the Tryavna Pass. The emperor barely escaped with his life; the Imperial treasury, including the crown and the cross, were captured by the victorious Bulgarians. After their success, Asen was crowned emperor and became known as Ivan Asen I. Peter IV voluntarily stepped down to make way for his more energetic brother; Peter IV retained his title but Ivan Asen assumed authority.

In the next four years, the focus of the war shifted to the south of the Balkan mountains. Ivan Asen's strategy of swiftly striking in different locations paid off, and he soon took control of the important cities Sofia and Niš to the south-west, clearing the way to Macedonia. In 1194, the Byzantines gathered a huge force composed of the eastern and western armies, but were defeated at the Battle of Arcadiopolis. Unable to resist, Isaac II tried to ally with the Hungarian king Béla III and make a joint attack against Bulgaria, but was deposed and blinded by his brother Alexios III Angelos. The Byzantines tried to negotiate peace but Ivan Asen demanded the return of all Bulgarian lands and the war continued. In 1196, the Byzantine army was again defeated at Serres, far to the south. Upon his return to Tarnovo, Ivan Asen was murdered by his cousin Ivanko in a plot inspired by Constantinople. Peter IV besieged Tarnovo and Ivanko fled to the Byzantine Empire, where he was made governor of Philippopolis. Peter IV was murdered less than a year after his brother's death.

Rise

The throne was succeeded by Kaloyan, Asen's and Peter IV's youngest brother. An ambitious and ruthless ruler, he wanted to gain international recognition and to complete the liberation of Bulgaria. Kaloyan also wanted revenge the Byzantines for blinding 14,000 of emperor Samuel's soldiers. Kaloyan called himself ''Romanoktonos'' (Roman-slayer) after Basil II, who was called ''Bulgaroktonos'' (Bulgar-slayer). He quickly allied himself with his brother's murderer, Ivanko. The Byzantines killed Ivanko, but the Bulgarians took the city of Constantia. In 1201, Kaloyan captured Varna, the last Byzantine stronghold in Moesia, which was defended by a large garrison. Despite capturing the city at Easter, Kaloyan ordered every Byzantine to be thrown in the moat. He then negotiated peace with Byzantines, securing Bulgarian gains in early 1202. While the Bulgarians were occupied in the south, the Hungarian king Andrew II and his Serbian vassal Vukan had annexed Belgrade, Braničevo, and Niš, but after negotiating peace, Kaloyan turned his attention to the north-west. In 1203, the Bulgarians pushed the Serbs out of Niš, defeated the Hungarian army in several battles along the valley of the Morava river, and recaptured their former territory.

Kaloyan knew the Byzantines would never recognize his imperial title; he began negotiations with Pope Innocent III. He based the claims on his predecessors in the First Bulgarian Empire; Simeon I, Peter I, and Samuel. The Pope was willing to recognize Kaloyan as king on the condition the Bulgarian Church would submit to Rome. After lengthy negotiations in which both acted diplomatically but without changing their positions, Kaloyan was crowned king in late 1204. Archbishop Basil was proclaimed Primate. Kaloyan had no intention of submitting to that decision; he sent the Pope a letter expressing his gratitude for the Imperial title he had received and the elevation of the Bulgarian Church to a Patriarchate. Eventually the Papacy tacitly accepted the Bulgarian position regarding the Imperial title. The union between Bulgaria and Rome remained strictly official; the Bulgarians did not change their Orthodox rites and traditions.

Several months before Kaloyan's coronation, the leaders of the Fourth Crusade turned on the Byzantine Empire and captured Constantinople, creating the Latin Empire. The Bulgarians tried to establish friendly relations with the Latins but were rebuffed and the Latins claimed their lands despite Papal recognition. Facing a common enemy, Kaloyan and the Byzantine aristocracy in Thrace made an alliance and the latter promised they would accept Kaloyan as their emperor. The decisive battle between the Bulgarian army and the Crusaders took place on 14 April 1205, at Adrianople, at which the Latins were defeated and their emperor Baldwin I was captured. The battle was a blow to the newly founded Latin Empire, which descended into chaos. After their victory, the Bulgarians retook most of Thrace, including the important city of Philippopolis. The unexpected Bulgarian successes caused the Byzantine nobility to plot against Kaloyan and ally themselves with the Latins. The plot in Tarnovo was quickly discovered; Kaloyan made brutal reprisals against the Byzantines in Thrace. The campaign against the Latins also continued; in 1206, the Bulgarians were victorious at the battle of Rusion and conquered a number of towns in Eastern Thrace. The following year, Boniface I, the King of Salonica, was killed in battle, but Kaloyan was murdered before he could begin the assault on the capital.

Kaloyan was succeeded by his cousin Boril, who tried to pursue his predecessor's policies but did not have his capability. His army was defeated by the Latins at Philippopolis, reversing most of Kaloyan's gains. Boril failed to maintain the integrity of the empire; his brother Strez took most of Macedonia for himself, Alexius Slav seceded his territory in the Rhodopes; in return for help suppressing a major rebellion in 1211, Boril was forced to cede Belgrade and Braničevo to Hungary. A campaign against Serbia in 1214 also ended in defeat.

As a result of the growing discontent with his policy, Boril was overthrown in 1218 by Ivan Asen II, son of Ivan Asen I, who had lived in exile after Kaloyan's death. After his coronation, Ivan Asen II arranged a wedding with Anna Maria, daughter of the Hungarian king Andrew II, and received the captured cities Belgrade and Braničevo as a dowry. He then signed an alliance with Theodore Komnenos, ruler of the most powerful Byzantine successor state, the Despotate of Epirus. With his northern border secured by the treaty, Theodore Komnenos conquered Salonica, greatly reducing the size of the Latin Empire. In 1225, Theodore proclaimed himself emperor. By 1228, the situation for the Latins became desperate; they entered into negotiations with Bulgaria, promising a marriage between the under-age emperor Baldwin II and Ivan Asen II's daughter Helena. This marriage would have made the Bulgarian emperor a regent in Constantinople, but in the meantime the Latins offered the regency to the French nobleman John of Brienne. Concerned with the actions of the Bulgarians, while marching on Constantinople in 1230, Theodore Komnenos invaded Bulgaria with a huge army. Surprised, Ivan Asen II gathered a small force and moved to the south to engage them. Instead of a banner, he used the peace treaty with Theodore's oath and seal stuck on his spear and won a major victory in the Battle of Klokotnitsa. Theodore Komnenos was captured along with his whole court and most of the surviving troops. Ivan Asen II released all ordinary soldiers and marched on the Epirote–controlled territories, where all cities and towns from Adrianople to Durazzo on the Adriatic Sea surrendered and recognized his rule. Theodore's brother Michael II Komnenos Doukas was allowed to rule in Salonica over the southern areas of the despotate as a Bulgarian vassal. It is possible Serbia accepted Bulgarian suzerainty at that time to counter the threat from Catholic Hungary.

In 1231, when John of Brienne arrived in Constantinople, Ivan Asen II allied with the Nicaean Empire against the Latins. After the Nicaeans recognized the Bulgarian Patriarchate in 1235, Ivan Asen II broke his union with the Papacy. The joint campaign against the Latins was successful, but they failed to capture Constantinople. With John of Brienne's death two years later, Ivan Asen II—who could have again become a regent of Baldwin II—decided to end his cooperation with Nicaea. His decision was further based on the assumption that after an allied success, Constantinople would again have become the centre of a restored Byzantine Empire, with the Nicaean dynasty as a ruling house. The Bulgarian–Latin cooperation was short-lived; Ivan Asen II remained at peace with his southern neighbours until the end of his reign. Shortly before his death in 1241, Ivan Asen II defeated part of the Mongol army returning to the east after a devastating attack on Poland and Hungary.

Decline

Ivan Asen II was succeeded by his infant son Kaliman I. Despite the initial success against the Mongols, the regency of the new emperor decided to avoid further raids and chose to pay them tribute instead. The lack of a strong monarch and increasing rivalries among the nobility caused Bulgaria to rapidly decline. Its main rival Nicaea avoided Mongol raids and gained power in the Balkans. After the death of 12-year-old Kaliman I in 1246, the throne was succeeded by several short-reigned rulers. The weakness of the new government was exposed when the Nicaean army conquered large areas in southern Thrace, the Rhodopes, and Macedonia—including Adrianople, Tsepina, Stanimaka, Melnik, Serres, Skopje, and Ohrid—meeting little resistance. The Hungarians also exploited Bulgarian weakness, occupying Belgrade and Braničevo. The Bulgarians reacted as late as 1253, invading Serbia and regaining the Rhodopes the following year. However, Michael II Asen's indecisiveness allowed the Nicaeans to regain all of their lost territory, with the exception of Tsepina. In 1255, the Bulgarians quickly regained Macedonia, whose Bulgarian population preferred the rule of Tarnovo to that of the Nicaeans. All gains were lost in 1256, after the Bulgarian representative Rostislav Mikhailovich betrayed his cause and reaffirmed Nicaean control over the disputed areas. This major setback cost the emperor's life and led to a period of instability and civil war between several claimants to the throne until 1257, when the boyar of Skopje Constantine Tikh emerged as a victor.

The new emperor had to deal with multiple foreign threats. In 1257, the Latins attacked and seized Messembria but could not hold the town. More serious was the situation to the north-west, where the Hungarians supported Rostislav, the self-proclaimed Emperor of Bulgaria in Vidin. In 1260, Constantine Tikh recovered Vidin and occupied the Severin Banat, but the next year a Hungarian counterattack forced the Bulgarians to retreat to Tarnovo, restoring Vidin to Rostislav. The city was soon controlled by the Bulgarian noble Jacob Svetoslav, but by 1266 he also styled himself emperor. The restoration of the Byzantine Empire under the ambitious Michael VIII Palaiologos further worsened Bulgaria's situation. A major Byzantine invasion in 1263 led to the loss of the coastal towns Messembria and Anchialus, and several cities in Thrace—including Philippopolis. Unable to effectively resist, Constantine Tikh organized a joint Bulgarian–Mongol campaign, but after ravaging Thrace the Mongols returned north of the Danube. The emperor became crippled after a hunting accident in the early 1260s, and fell under the influence of his wife Maria Palaiologina, whose constant intrigues fueled divisions among the nobility.

Constant Mongol raids, economic difficulties, and the emperor's illness led to a massive popular uprising in the north-east in 1277. The rebel army, led by the swineherd Ivaylo, defeated the Mongols twice, greatly boosting Ivaylo's popularity. Ivaylo then turned on and defeated the regular army under the command of Constantine Tikh. He personally killed the emperor, claiming the latter did nothing to defend his honour. Fearing a revolt in Byzantium, and willing to exploit the situation, the emperor Michael VIII sent an army led by Ivan Asen III, a Bulgarian pretender to the throne, but the rebels reached Tarnovo first. Constantine Tikh's widow Maria married Ivaylo and he was proclaimed emperor. After the Byzantines failed, Michael VIII turned to the Mongols, who invaded Dobrudzha and defeated Ivaylo's army, forcing him to retreat to Drastar, where he withstood a three-month siege. After his defeat, Ivaylo was betrayed by the Bulgarian nobility, who opened the gates of Tarnovo to Ivan Asen III. In early 1279, Ivaylo broke off the siege at Drastar and besieged the capital. The Byzantines sent a 10,000-strong army to relieve Ivan Asen III, but suffered defeat by Ivaylo at the battle of Devina. Another army of 5,000 had a similar fate, forcing Ivan Asen III to flee. Ivaylo's situation did not improve, however—after two years of constant warfare his support was diminished, the Mongols were not decisively defeated, and the nobility remained hostile. By the end of 1280, Ivaylo sought refuge with his former enemies the Mongols, who under Byzantine influence killed him. The nobility chose the powerful noble and ruler of Cherven, George I Terter, as emperor. He reigned for twelve years, bringing even stronger Mongol influence and the loss of most of the remaining lands in Thrace to the Byzantines. This period of instability and uncertainty continued until 1300, when for a few months the Mongol Chaka ruled in Tarnovo.

Temporary stabilization

In 1300, Theodore Svetoslav, George I's eldest son, took advantage of a civil war in the Golden Horde, overthrew Chaka, and presented his head to the Mongol khan Toqta. This brought an end to Mongol interference in Bulgarian domestic affairs and secured Southern Bessarabia as far as Bolgrad to Bulgaria. The new emperor began to rebuild the country's economy, subdued many of the semi-independent nobles, and executed as traitors those he held responsible for assisting the Mongols, including Patriarch Joachim III. The Byzantines, interested in Bulgaria's continuous instability, supported pretenders Michael and Radoslav with their armies, but were defeated by Theodore Svetoslav's uncle Aldimir, the despot of Kran. Between 1303 and 1304, the Bulgarians launched several campaigns and retook many towns in north-eastern Thrace. The Byzantines tried to counter the Bulgarian advance but suffered a major defeat in the battle of Skafida. Unable to change the status quo, they were forced to make peace with Bulgaria in 1307, acknowledging Bulgarian gains. Theodore Svetoslav spent the rest of his reign in peace with his neighbors. He maintained cordial relations with Serbia and in 1318, its king Stephen Milutin, paid a visit to Tarnovo. The years of peace brought economic prosperity and boosted commerce; Bulgaria became a major exporter of agricultural commodities, especially wheat.

During the early 1320s, tensions between Bulgaria and the Byzantines rose as the latter descended into a civil war and the new emperor George II Terter seized Philippopolis. In the confusion following George II's unexpected death in 1322 without leaving a successor, the Byzantines recaptured the city and other Bulgarian-seized towns in northern Thrace. The energetic despot of Vidin, Michael Shishman, was elected emperor the next year; he immediately turned on the Byzantine emperor Andronikos III Palaiologos, regaining the lost lands. In late 1324, the two monarchs signed a peace treaty, strengthened by a marriage between the Bulgarian ruler and Theodora Palaiologina. Michael Shishman divorced his Serbian wife Anna Neda, causing a deterioration of relations with Serbia. This change of political course is explained by the rapid growth of Serbian power and its penetration into Macedonia.

The Bulgarians and the Byzantines agreed to a joint campaign against Serbia, but it took five years until the differences and tensions between Bulgaria and Byzantium were overcome. Michael Shishman gathered 15,000 troops and invaded Serbia. He engaged the Serbian king Stephen Dečanski, who commanded an approximately equal force, near the border town of Velbazhd. The two rulers, both expecting reinforcements, agreed to a one-day truce but when a Catalan detachment under the king's son Stephen Dušan arrived, the Serbs broke their word. The Bulgarians were defeated in the ensuing Battle of Velbazhd and their emperor perished. Despite their victory, the Serbs did not risk an invasion of Bulgaria and the two sides agreed to peace. As a result, Ivan Stephen, the eldest son of the dead emperor by his Serbian wife, succeeded him in Tarnovo and was deposed after a brief rule. Bulgaria did not lose territory but could not stop the Serbian expansion in Macedonia.

After the disaster at Velbazhd, the Byzantines attacked Bulgaria and seized a number of towns and castles in northern Thrace. Their success ended in 1332, when the new Bulgarian emperor Ivan Alexander defeated them in the battle of Rusokastro, recovering the captured territories. In 1344, the Bulgarians entered the Byzantine civil war of 1341–47 on the side of John V Palaiologos against John VI Kantakouzenos, capturing nine towns along the Maritsa

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