The Treaty of Nymphaeum ( el, Συνθήκη του Νυμφαίου) was a

peace treaty A peace treaty is an agreement between two or more hostile parties, usually countries or governments, which formally ends a state of war between the parties. It is different from an armistice An armistice is a formal agreement of warring ...

signed in December 1214 between the

Nicaean Empire The Empire of Nicaea or the Nicene Empire is the conventional historiographic name for the largest of the three Byzantine Greek''A Short history of Greece from early times to 1964'' by W. A. Heurtley, H. C. Darby, C. W. Crawley, C. M. Woodhouse ...

, successor state of the

Byzantine Empire The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinopl ...

, and the

Latin Empire The Latin Empire, also referred to as the Latin Empire of Constantinople, was a feudal Crusader state founded by the leaders of the Fourth Crusade on lands captured from the Byzantine Empire. The Latin Empire was intended to replace the Byzant ...

, which was established in the aftermath of the Fourth Crusade of 1204.

Background

Following the Fourth Crusade,

Baldwin IX of Flanders Baldwin I ( nl, Boudewijn; french: Baudouin; July 1172 – ) was the first Emperor of the Latin Empire of Constantinople; Count of Flanders (as Baldwin IX) from 1194 to 1205 and Count of Hainaut (as Baldwin VI) from 1195-1205. Baldwin was o ...

was elected emperor of the Latin Empire and was recognized to have not only a portion of

Constantinople la, Constantinopolis ota, قسطنطينيه , alternate_name = Byzantion (earlier Greek name), Nova Roma ("New Rome"), Miklagard/Miklagarth (Old Norse), Tsargrad ( Slavic), Qustantiniya ( Arabic), Basileuousa ("Queen of Cities"), Megalopolis ( ...

(the remainder was given to the Venetians), but also the north-west region of

Asia Minor Anatolia, tr, Anadolu Yarımadası), and the Anatolian plateau, also known as Asia Minor, is a large peninsula in Western Asia and the westernmost protrusion of the Asian continent. It constitutes the major part of modern-day Turkey. The re ...

, although recognition of sovereignty did not mean actual control of the territory. It was up to the emperor to exercise that control, by force of arms if necessary. Following the Fourth Crusade, Baldwin was occupied with events in

Thrace Thrace (; el, Θράκη, Thráki; bg, Тракия, Trakiya; tr, Trakya) or Thrake is a geographical and historical region in Southeast Europe, now split among Bulgaria, Greece, and Turkey, which is bounded by the Balkan Mountains to ...

and was later taken prisoner by the

Bulgarians Bulgarians ( bg, българи, Bǎlgari, ) are a nation and South Slavic ethnic group native to Bulgaria and the rest of Southeast Europe. Etymology Bulgarians derive their ethnonym from the Bulgars. Their name is not completely unders ...

in the

Battle of Adrianople The Battle of Adrianople (9 August 378), sometimes known as the Battle of Hadrianopolis, was fought between an Eastern Roman army led by the Eastern Roman Emperor Valens and Gothic rebels (largely Thervings as well as Greutungs, non-Gothic A ...

in April 1205. Asia Minor was ignored by the Latins for the time being, thus giving a breathing space for Theodore Lascaris, who had declared himself emperor and was based at

Nicaea Nicaea, also known as Nicea or Nikaia (; ; grc-gre, Νίκαια, ) was an ancient Greek city in Bithynia, where located in northwestern Anatolia and is primarily known as the site of the First and Second Councils of Nicaea (the first and s ...

, to consolidate his power and focus his attention on the Sultanate of Rûm during this time. Baldwin's brother,

Henry Henry may refer to: People *Henry (given name) * Henry (surname) * Henry Lau, Canadian singer and musician who performs under the mononym Henry Royalty * Portuguese royalty ** King-Cardinal Henry, King of Portugal ** Henry, Count of Portugal, ...

, took over the Latin Empire and started operations against the Nicaean Empire at the end of 1206, but these were only minor engagements until Henry focused his attention in 1211.. On October 15 of that year, Henry won a major victory at the Rhyndacus River and pushed forward onto

Pergamum Pergamon or Pergamum ( or ; grc-gre, Πέργαμον), also referred to by its modern Greek form Pergamos (), was a rich and powerful ancient Greek city in Mysia. It is located from the modern coastline of the Aegean Sea on a promontory on th ...

and Nymphaeum, but guerrilla warfare on Theodore's part limited Henry's further advances. Due to both sides being exhausted, the Treaty of Nymphaeum was signed between the two emperors, halting the Latin advance into Asia Minor. The Latin holdings were confined to the north-western part of Anatolia, comprising the coasts of Bithynia and most of

Mysia Mysia (UK , US or ; el, Μυσία; lat, Mysia; tr, Misya) was a region in the northwest of ancient Asia Minor (Anatolia, Asian part of modern Turkey). It was located on the south coast of the Sea of Marmara. It was bounded by Bithynia on th ...

Aftermath

Although both sides would continue to fight for years to come, there were some important consequences of this peace agreement. First, the peace treaty effectively recognized both parties, as neither one was strong enough to destroy the other. The second consequence of the treaty was that

David Komnenos David Komnenos ( el, Δαβίδ Κομνηνός) (c. 1184 – 1212) was one of the founders of the Empire of Trebizond and its joint ruler together with his brother Alexios until his death. At least two lead seals and an inscription found on a towe ...

, who had been a vassal of Henry and who had been carrying out his own war against Nicaea with the support of the Latin Empire, now effectively lost that support. Theodore was thus able to annex all of David's lands west of Sinope in late 1214, gaining access to the

Black Sea The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Rom ...

. The third consequence was that Theodore was now free to wage war against the Seljuqs without the distraction of the Latins for the time being. Nicaea was able to consolidate their eastern frontier for the remainder of the century. Hostilities broke out again in 1224, and a crushing Nicaean victory at the Second

Battle of Poemanenum The Battle of Poimanenon or Poemanenum was fought in early 1224 (or possibly late 1223) between the forces of the two main successor states of the Byzantine Empire; the Latin Empire and the Byzantine Greek Empire of Nicaea. The opposing forces me ...

reduced Latin territories in Asia effectively only to the

Nicomedia Nicomedia (; el, Νικομήδεια, ''Nikomedeia''; modern İzmit) was an ancient Greek city located in what is now Turkey. In 286, Nicomedia became the eastern and most senior capital city of the Roman Empire (chosen by the emperor Diocleti ...

n peninsula. This treaty allowed the Nicaeans to go on the offensive in

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a subcontinent of Eurasia and it is located entirel ...

years later, culminating in the

reconquest of Constantinople The Reconquest of Constantinople (1261) was the recapture of the city of Constantinople by the forces of the Empire of Nicaea, leading to the re-establishment of the Byzantine Empire under the Palaiologos dynasty, after an interval of 57 years ...

in 1261..

References

Sources

* {{DEFAULTSORT:Treaty Of Nymphaeum 1214 Treaties of the Empire of Nicaea Latin Empire Nymphaeum 1214 Nymphaeum 1214 in Europe 1214 in Asia