The name of the city comes from the name of a Gallic tribe (parisis) inhabiting the region at the time of the Roman conquest. The historical heart of Paris is the Île de la Cité, a small island largely occupied by the huge Palais de Justice and the Cathedral of Notre Dame de Paris. It is connected with the smaller Ile Saint-Louis (another island) occupied by elegant houses built in the 17th and 18th centuries.
By this time, Paris was a typically crowded early medieval city with timber buildings alongside surviving Roman remains. According to the chronicler Geoffrey of Tours, it suffered a disastrous fire in 585. The city grew beyond the boundaries of the Ile, with suburbs being established on both banks of the river.
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.
Under Louis XVI, Paris reached new heights of prestige as a centre of the arts, sciences and philosophy. It was in Paris that the Montgolfier brothers made their historic balloon ascents in 1783. However, the French state was by now virtually bankrupt, its finances drained by the Seven Years' War and the French intervention in the American War of Independence.
The victor was, to the surprise of many, Louis-Napoleon Bonaparte - the nephew of the late Emperor. He won by an overwhelming majority (receiving 75% of the votes cast) but was not content with being a mere president. On 2 December 1851 he seized power in a coup, declared himself the Emperor Napoleon III and settled in the Tuileries Palace.
The arrival in Paris of the Industrial Revolution prompted the city's breakneck growth, with migrant workers arriving from the countryside on newly-constructed railway lines. By now its population was over 900,000 people, making it one of the largest cities in Europe and far surpassing any other city in France (the next largest, Lyon and Marseille, had only about 115,000 each).
When Hitler invaded France on 14 May 1940 it took the German army only a month to reach Paris, invading through neutral Belgium around the Maginot Line, where the French defenses were massed. Paris fell with virtually no resistance on 14 June. Much of the city's population fled, with 1.6 million of its 3.5 million people leaving between May and June 1940.
The city's escape from Attila proved a short-lived reprieve, as it was attacked and overrun in 464 by Childeric I (Childeric the Frank). His son Clovis I made the city his capital in 506 and was buried there on his death in 511, alongside St. Geneviéve.
A concentration camp was established in the Parisian suburb of Drancy to serve as a waystation en route to Auschwitz. Some 70,000 people passed through the camp. Contrary to later assertions by postwar French governments, the camp was run by the French authorities on behalf of the Nazis until July 1943, and the roundups were orchestrated by the Vichy French police. This was only acknowledged by the French government in 1995 and memorialised only as recently as 2001.
The furious crowd began attacking the palace and were only placated when Louis himself appeared and agreed to return to Paris with his family. The royal family were reduced to virtual prisoners in the Tuileries. They tried to escape on 20 June 1791 but were caught and returned to Paris as captives.
Several schools on the Left Bank were grouped together into the Sorbonne, which counts Albertus Magnus and St. Thomas Aquinas among its early scholars. In the Middle Ages Paris prospered as a trading and intellectual nucleus, interrupted temporarily when the Black Death struck in the 14th century. Under the reign of King Louis XIV, the Sun King, from 1643 to 1715, the royal residence was moved from Paris to nearby Versailles.
Paris is densely covered by a metro system, the Métro, as well as by a large number of bus lines. This interconnects with a high-speed regional network, the RER, and also the train network: commuter lines, national train lines, and the TGV (or derivatives like Thalys or Eurostar for specific destinations). There are two tangential tramway lines in the suburbs: Line T1 runs from Saint-Denis to Noisy-le-Sec, line T2 runs from La Défense to Issy. A third line along the southern orbital road is currently under construction.
Under the rule of Philippe Auguste, who became king in 1180, a number of major building works were carried out in Paris. He built a new city wall and began the construction of the Louvre Palace, as well as paving streets and establishing a covered market at Les Halles (where it would remain until 1969).
During the latter half of the 18th century, Paris became the intellectual and cultural capital of the Western world. It became a centre of the Enlightenment with its salons becoming the centre of the new thinking of the "Age of Reason." This was positively encouraged by the state, with Louis' mistress Madame de Pompadour supporting the city's intellectuals and prompting the king to construct striking new monuments.
The city was neglected by the Empire and suffered grievously from Viking raiders who repeatedly sailed upriver to attack it. On March 28, 845 Paris was sacked by Viking raiders, probably under Ragnar Lodbrok, who collected a huge ransom in exchange for leaving. The weakness of the late Carolingian kings led to the gradual rise in power of the Counts of Paris.