After thirteen years the

First French Empire The First French Empire, officially the French Republic, then the French Empire (; Latin: ) after 1809, also known as Napoleonic France, was the empire ruled by Napoleon Bonaparte, who established French hegemony over much of continental ...

abolished the French Republican Calendar in favour of the Gregorian calendar.

Events

January–March

* January 11 – The

Michigan Territory The Territory of Michigan was an organized incorporated territory of the United States that existed from June 30, 1805, until January 26, 1837, when the final extent of the territory was admitted to the Union as the State of Michigan. Detroi ...

is created. * February 7 – King

Anouvong Chao Anouvong ( lo, ເຈົ້າອານຸວົງສ໌; th, เจ้าอนุวงศ์; ), or regnal name Xaiya Setthathirath V ( lo, ໄຊຍະເສດຖາທິຣາຊທີ່ຫ້າ; th, ไชยเชษฐาธ� ...

becomes ruler of

Vientiane Vientiane ( , ; lo, ວຽງຈັນ, ''Viangchan'', ) is the capital and largest city of Laos. Vientiane is divided administratively into 9 cities with a total area of only approx. 3,920 square kilometres and is located on the banks of ...

on the death of his brother

Inthavong Chao Inthavong ( lo, ເຈົ້າອິນທະວົງສ໌; th, เจ้าอินทวงศ์; died 7 February 1805), or known as his regnal name Xaiya Setthathirath III, was the 5th king of the Kingdom of Vientiane (r. 1795 to 1805 ...

. * February 15 – The

Harmony Society The Harmony Society was a Christian theosophy and pietist society founded in Iptingen, Germany, in . Due to religious persecution by the Lutheran Church and the government in Württemberg, the group moved to the United States,Robert Paul Sutto ...

is officially formed as a Christian community in Harmony, Pennsylvania. * March 1 – Justice

Samuel Chase Samuel Chase (April 17, 1741 – June 19, 1811) was a Founding Father of the United States, a signatory to the Continental Association and United States Declaration of Independence as a representative of Maryland, and an Associate Justice of th ...

is acquitted of

impeachment Impeachment is the process by which a legislative body or other legally constituted tribunal initiates charges against a public official for misconduct. It may be understood as a unique process involving both political and legal elements. I ...

charges by the

United States Senate The United States Senate is the upper chamber of the United States Congress, with the House of Representatives being the lower chamber. Together they compose the national bicameral legislature of the United States. The composition and ...

. * March 4 –

Thomas Jefferson Thomas Jefferson (April 13, 1743 – July 4, 1826) was an American statesman, diplomat, lawyer, architect, philosopher, and Founding Father who served as the third president of the United States from 1801 to 1809. He was previously the nati ...

is sworn in for a second term as President of the United States. * March 5 – The New Brunswick Legislature passes a bill to advance literacy in the province, which eventually leads to the creation of public education in Canada.

April–June

* April 7 –

Beethoven Ludwig van Beethoven (baptised 17 December 177026 March 1827) was a German composer and pianist. Beethoven remains one of the most admired composers in the history of Western music; his works rank amongst the most performed of the classic ...

's Symphony No. 3, ''Eroica'', has its public premiere at the

Theater an der Wien The is a historic theatre in Vienna located on the Left Wienzeile in the Mariahilf district. Completed in 1801, the theatre has hosted the premieres of many celebrated works of theatre, opera, and symphonic music. Since 2006, it has served pri ...

in Vienna under his baton. * April 27 – Battle of Derne:

United States Marines The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through c ...

and Berbers attack the

Tripoli Tripoli or Tripolis may refer to: Cities and other geographic units Greece *Tripoli, Greece, the capital of Arcadia, Greece *Tripolis (region of Arcadia), a district in ancient Arcadia, Greece * Tripolis (Larisaia), an ancient Greek city in t ...

tan city of Derna (the ''Shores of Tripoli''). * April 29 –

Rutger Jan Schimmelpenninck Rutger Jan Schimmelpenninck (31 October 1761 – 15 February 1825), Lord of Nyenhuis, Peckedam and Gellicum, was a Dutch jurist, ambassador and politician who served as Grand Pensionary of the Batavian Republic from 1805 to 1806. Education Sch ...

is appointed as Grand Pensionary of the Batavian Republic by Napoleon. * May 26 – Napoleon is crowned

King of Italy King of Italy ( it, links=no, Re d'Italia; la, links=no, Rex Italiae) was the title given to the ruler of the Kingdom of Italy after the fall of the Western Roman Empire. The first to take the title was Odoacer, a barbarian military leader, ...

. * May 31 – June 2 –

Napoleonic Wars The Napoleonic Wars (1803–1815) were a series of major global conflicts pitting the French Empire and its allies, led by Napoleon I, against a fluctuating array of European states formed into various coalitions. It produced a period of Fren ...

Battle of Diamond Rock The Battle of Diamond Rock took place between 31 May and 2 June 1805 during the Napoleonic Wars. It was an attempt by Franco-Spanish force dispatched under Captain Julien Cosmao to retake Diamond Rock, at the entrance to the bay leading to Fo ...

– A Franco-Spanish fleet captures the strategic island of

Diamond Rock Diamond Rock (french: rocher du Diamant) is a 175-metre-high (574 ft)Martinique Martinique ( , ; gcf, label=Martinican Creole, Matinik or ; Kalinago language, Kalinago: or ) is an island and an Overseas department and region, overseas department/region and single territorial collectivity of France. An integral part of ...

in the

West Indies The West Indies is a subregion of North America, surrounded by the North Atlantic Ocean and the Caribbean Sea that includes 13 independent island countries and 18 dependencies and other territories in three major archipelagos: the Great ...

, from the British. * June 1 – Tuscan-born composer

Luigi Boccherini Ridolfo Luigi Boccherini (, also , ; 19 February 1743 – 28 May 1805) was an Italian composer and cellist of the Classical era whose music retained a courtly and '' galante'' style even while he matured somewhat apart from the major Eur ...

is buried in the Basílica pontificia de San Miguel in Madrid after being found dead on May 28. * June 4 ** The

First Barbary War The First Barbary War (1801–1805), also known as the Tripolitan War and the Barbary Coast War, was a conflict during the Barbary Wars, in which the United States and Sweden fought against Tripolitania. Tripolitania had declared war against S ...

ends between Tripoli and the United States of America. ** The first

Trooping the Colour Trooping the Colour is a ceremony performed every year in London, United Kingdom, by regiments of the British Army. Similar events are held in other countries of the Commonwealth. Trooping the Colour has been a tradition of British infantry regi ...

ceremony is held at the

Horse Guards Parade Horse Guards Parade is a large parade ground off Whitehall in central London (at grid reference ). It is the site of the annual ceremonies of Trooping the Colour, which commemorates the monarch's official birthday, and the Beating Retreat. ...

in London. ** Detroit burns to the ground; most of the city is destroyed. * June 13 –

Lewis and Clark Expedition The Lewis and Clark Expedition, also known as the Corps of Discovery Expedition, was the United States expedition to cross the newly acquired western portion of the country after the Louisiana Purchase. The Corps of Discovery was a select gr ...

in the United States: Scouting ahead of the expedition,

Meriwether Lewis Meriwether Lewis (August 18, 1774 – October 11, 1809) was an American explorer, soldier, politician, and public administrator, best known for his role as the leader of the Lewis and Clark Expedition, also known as the Corps of Discovery, wi ...

and four companions sight the Great Falls of the Missouri River, confirming they are heading in the right direction.

July–September

* July 9 –

Muhammad Ali Pasha Muhammad Ali Pasha al-Mas'ud ibn Agha, also known as Muhammad Ali of Egypt and the Sudan ( sq, Mehmet Ali Pasha, ar, محمد علي باشا, ; ota, محمد علی پاشا المسعود بن آغا; ; 4 March 1769 – 2 August 1849), was ...

founds his

dynasty A dynasty is a sequence of rulers from the same family,''Oxford English Dictionary'', "dynasty, ''n''." Oxford University Press (Oxford), 1897. usually in the context of a monarchical system, but sometimes also appearing in republics. A ...

in Egypt. * July 26 – 1805 Molise earthquake: 5,573 people in

Molise it, Molisano (man) it, Molisana (woman) , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = , demographics1_footnotes = , demographics1_title1 = , demographics1_info1 ...

and

Campania (man), it, Campana (woman) , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = , demographics1_footnotes = , demographics1_title1 = , demographics1_info1 = , demog ...

, Italy, are killed. * August 12 –

: U.S. Army Captain

becomes the first white person to reach the

Continental Divide of the Americas The Continental Divide of the Americas (also known as the Great Divide, the Western Divide or simply the Continental Divide; ) is the principal, and largely mountainous, hydrological divide of the Americas. The Continental Divide extends from t ...

, crossing to the west at Lemhi Pass. * August 27 – Napoleon orders the

Grande Armée ''La Grande Armée'' (; ) was the main military component of the French Imperial Army commanded by Emperor Napoleon Bonaparte during the Napoleonic Wars. From 1804 to 1808, it won a series of military victories that allowed the French Empi ...

("The Great Army") of some 165,000 men to march to the

Rhine River ), Surselva, Graubünden, Switzerland , source1_coordinates= , source1_elevation = , source2 = Rein Posteriur/Hinterrhein , source2_location = Paradies Glacier, Graubünden, Switzerland , source2_coordinates= , so ...

to deal with the Austrian and Russian threats on the frontier. The French army is organized into seven corps and is supported by 36–40 cannons each. Napoleon orders Marshal

Joachim Murat Joachim Murat ( , also , ; it, Gioacchino Murati; 25 March 1767 – 13 October 1815) was a French military commander and statesman who served during the French Revolutionary Wars and Napoleonic Wars. Under the French Empire he received the m ...

with his I Cavalry Corps (some 20,000 men), to make feint at