Napoleon's military campaigns against the British, Austrians and Russians initially met with great success but hubris, overconfidence and poor planning caused the annihilation of his army in 1813 in the depths of a Russian winter. Russian and Austrian armies invaded France in 1814 and on 31 March 1814, Paris fell to the Russians - the first time in 400 years that the city had been conquered by a foreign power.
As an exception to the normal rules for French cities, some powers normally vested in the mayor of the city are instead vested in a representative of the national government, the Prefecture of Police which also controls the Paris Fire Brigade. As an example, Paris has no municipal police force, though it has some traffic wardens. This is a legacy of the situation that up to 1977, Paris had no mayor and was essentially run by the prefectoral administration.
The revolutionaries became steadily more extreme, turning on the "enemy within." This included not just royalists but those accused of simply being not sufficiently revolutionary, including Danton and Camille Desmoulins. Over 1,300 people were executed in just six weeks in 1794. In the end, the extremists' bloodthirstiness destroyed their own moral standing; a group of moderates seized control in July 1794, sending Robespierre and his allies to the guillotine in a last spasm of bloodletting.
An invading Prussian army heading for Paris was defeated shortly afterwards, clearing the way for the bloodiest phase of the Revolution. A guillotine was erected in what is now the Place de la Concorde and was used on 21 January 1793 to execute Louis XVI. Marie Antoinette followed in October 1793.
Roman rule had ceased by 508, when Clovis the Frank made the city the capital of the Merovingian dynasty of the Franks. Viking invasions during the 800s forced the Parisians to build a fortress on the Ile de la Cité. On March 28, 845 Paris was sacked by Viking raiders, probably under Ragnar Lodbrok, who collected a huge ransom in exchange for leaving.
The following month, more than 2,000 people were massacred in Paris as revolutionary mobs hunted down and killed anyone seen as an opponent of the new order. The monarchy was formally abolished on 22 September 1792, "Day I of Year I of the French Republic."
Louis died in 1643, leaving the throne to his five-year-old heir Louis XIV. The new king and his family were forced to flee the city in 1648 by a rebellion, known as the Fronde, against royal authoritarianism and excessive taxes. Rebel rule proved considerably worse, however, and the king returned to a hero's welcome in 1653.
The history of Paris spans over 2,000 years, during which time the city grew from a small Celtic settlement to the multicultural capital of a modern European state.
Louis XIII became king at the age of only eight, with political power exercised by his mother Marie de Médicis in the role of regent. Although Louis took over when he reached the age of majority, at 15, the real power was exercised by the brilliant but ruthless Cardinal Richelieu, who greatly expanded royal power.
The French Revolution began with the storming of the Bastille on July 14, 1789. Many of the conflicts in the next few years were between Paris and the outlying rural areas.
His grandson Louis IX, renowned for his extreme piety (and later canonised as St Louis) established the city as a major centre of pilgrimage in the 13th century with the construction of the cathedral of Notre Dame de Paris, the Basilica of St Denis and the Sainte-Chapelle on the Ile de la Cité. The latter was one of the finest medieval Gothic religious buildings ever constructed and was built to house Louis' most precious possession - the (alleged) Crown of Thorns, purchased from the bankrupt Byzantine Empire at an extortionate price.