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.
The Capetian line died out in 1328, leaving no male heir. Edward II of England claimed the French throne by virtue of his descent (via his mother) from Philip IV of France. This was rejected by the French barons, who supported the rival claim of Philippe of Valois (Philip VI of France). The Hundred Years' War thus began, followed swiftly by the arrival of the Black Death.
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.
After the restoration of civilian rule and the proclamation of the Fourth Republic in 1946, Paris made a rapid recovery from the war, aided by its lack of much physical damage. Like the rest of France, however, it was caught up in the bloody but unsuccessful wars against nationalist guerrillas in Indochina and Algeria in the 1950s and 1960s. During the Algerian war of independence, independentists detonated bombs in Paris.
Paris was, however, not spared from the religious violence affecting the rest of the country as Protestantism gained ground in defiance of an increasingly harsh Catholic backlash. Paris was a predominantly Catholic city - so much so that Ignatius Loyola founded the Society of Jesus there in 1534 - but also had a growing Protestant population. The rival religious factions pursued an increasingly bloodthirsty feud, with religiously-inspired assassinations and burnings at the stake.
Tensions were high, and led to the largest abuse in the city's postwar history, when the Paris police, told wrong news about policemen having been murdered by independentists, massacred an estimated 300 pro-independence demonstrators on 17 August 1961; remarkably, the event, though known in some circles, was largely ignored until the 1990s. (See Paris massacre of 1961)
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.
The lines stayed mostly static for the next four years, with Paris experiencing the occasional bombardment from enemy aircraft and the giant "Big Bertha" long-distance artillery guns. The city's hedonistic life survived for a while before being subdued by the bloodshed on the front and the impact of rationing and a devastating flu epidemic in 1916. The war was finally ended by the Armistice of 11 November 1918, signed at Compiegne to the northeast of Paris.
Extreme right- and left-wing parties flourished, and on 5 February 1934 a mob of Fascist and other far-rightists attempted to storm the National Assembly in a botched coup attempt. In the ensuing violence, fifteen people were killed and another 1,500 wounded. In response, the Socialists and Communists united to form a Popular Front, which took power in 1936 but fell only a year later.
The powers of the monarchy were in theory confined by a Charter of Liberties but in practice both Louis and Charles ran an authoritarian regime reliant on Church support. On 25 July 1830 Charles issued the repressive Ordinances of St-Cloud, abolishing the freedom of the press, dissolving the Chamber of Deputies and restricting voting rights to the landed gentry only.
Under de Gaulle's successors, Georges Pompidou and Valéry Giscard d'Estaing, Paris underwent major physical development. The radical Centre Pompidou was built along with the ultra-modern complex at La Villette (originally an abattoir, now a science museum).
France's political divisions were a major factor in its ill-preparedness for the outbreak of the Second World War on 3 September 1939. Some of the Catholic Right were openly hostile to parliamentary democracy, Socialism and Communism, and welcomed the possibility of a fascist regime, even imposed by foreign forces.
Louis and those who supported an agreement with the monarchy were accused by the radical Jacobins of being the stooges of foreign powers, and on 10 August 1792 a mob demanded that the National Assembly depose the king. When the demand was refused, the mob attacked the Tuilleries and seized the royal family. Power now passed to the radical Commune de Paris, led by Georges Danton, Marat and Robespierre.
Less positively and very controversially, the ancient market at Les Halles was demolished and replaced with a notoriously ugly underground shopping mall, and the 209m Tour Montparnasse skyscraper was built leading to fears that Paris would become overrun with American-style skyscrapers (a move strongly resisted ever since).