Calais (/ˈkæleɪ/, also US: /kæˈleɪ/, traditionally /ˈkælɪs/, French: (listen); Picard: Calés; Dutch: Kales) is a city and major ferry port in northern France in the department of Pas-de-Calais, of which it is a sub-prefecture. Although Calais is by far the largest city in Pas-de-Calais, the department's prefecture is its third-largest city of Arras. The population of the metropolitan area at the 2010 census was 126,395. Calais overlooks the Strait of Dover, the narrowest point in the English Channel, which is only 34 km (21 mi) wide here, and is the closest French town to England. The White Cliffs of Dover can easily be seen on a clear day from Calais. Calais is a major port for ferries between France and England, and since 1994, the Channel Tunnel has linked nearby Coquelles to Folkestone by rail. Due to its position, Calais since the Middle Ages has been a major port and a very important centre for transport and trading with England. Calais came under English control after Edward III of England captured the city in 1347, followed by a treaty in 1360 that formally assigned Calais to English rule. Calais grew into a thriving centre for wool production, and came to be called the 'brightest jewel in the English crown' owing to its great importance as the gateway for the tin, lead, lace and wool trades (or 'staples'). Calais remained under English control until its capture by France in 1558. The town was virtually razed to the ground during World War II, when in May 1940, it was a strategic bombing target of the invading German forces who took the town during the Siege of Calais. During World War II, the Germans built massive bunkers along the coast in preparation for launching missiles on England. The old part of the town, Calais proper (known as Calais-Nord), is situated on an artificial island surrounded by canals and harbours. The modern part of the town, St-Pierre, lies to the south and south-east. In the centre of the old town is the Place d'Armes, in which stands the Tour du Guet, or watch-tower, a structure built in the 13th century, which was used as a lighthouse until 1848 when a new lighthouse was built by the port. South east of the Place is the church of Notre-Dame, built during the English occupancy of Calais. It is arguably the only church built in the English perpendicular style in all of France. In this church former French President Charles de Gaulle married his wife Yvonne Vendroux. South of the Place and opposite the Parc St Pierre is the Hôtel-de-ville (the town hall), and the belfry from the 16th and early 17th centuries. Today, Calais is visited by more than 10 million annually. Aside from being a key transport hub, Calais is also a notable fishing port and a centre for fish marketing, and some 3,000 people are still employed in the lace industry for which the town is also famed. The early history of habitation in the area is limited. The Romans called the settlement Caletum. Julius Caesar mustered 800 to 1,000 sailing boats, five legions and some 2,000 horses at Calais, due to its strategic position, to attack Britannia. The English could hold on to it for so many centuries because it remained an island surrounded by marshes, and therefore almost impossible to attack from the land. At some time before the 10th century, it would have been a Flemish-speaking fishing village on a sandy beach backed by pebbles and a creek, with a natural harbour at the west edge of the early medieval estuary of the River Aa. As the pebble and sand ridge extended eastward from Calais, the haven behind it developed into fen, as the estuary progressively filled with silt and peat. Afterwards, canals were cut between Saint-Omer, the trading centre formerly at the head of the estuary, and three places to the west, centre and east on the newly formed coast: respectively Calais, Gravelines and Dunkirk. Calais was improved by the Count of Flanders in 997 and fortified by the Count of Boulogne in 1224. The first document mentioning the existence of this community is the town charter granted by Mathieu d'Alsace, Count of Boulogne, in 1181 to Gerard de Guelders; Calais thus became part of the county of Boulogne. In 1189, Richard the Lionheart is documented to have landed at Calais on his journey to the Third Crusade. English wool trade interests and King Edward III's claims to be heir to the Kingdom of France led to the Battle of Crécy between England and France in 1346, followed by Edward's siege and capture of Calais in 1347. Angered, the English king demanded reprisals against the town's citizens for holding out for so long ('obstinate defense') and ordered that the town's population be killed en masse. He agreed, however, to spare them, on condition that six of the principal citizens would come to him, bareheaded and barefooted and with ropes around their necks, and give themselves up to death. On their arrival he ordered their execution, but pardoned them when his queen, Philippa of Hainault, begged him to spare their lives. This event is commemorated in The Burghers of Calais (Les Bourgeois de Calais), one of the most famous sculptures by Auguste Rodin, erected in the city in 1895. Though sparing the lives of the delegation members, King Edward drove out most of the French inhabitants, and settled the town with English. The municipal charter of Calais, previously granted by the Countess of Artois, was reconfirmed by Edward that year (1347). In 1360 the Treaty of Brétigny assigned Guînes, Marck and Calais—collectively the 'Pale of Calais'—to English rule in perpetuity, but this assignment was informally and only partially implemented. On 9 February 1363 the town was made a staple port. It had by 1372 become a parliamentary borough sending burgesses to the House of Commons of the Parliament of England. It remained part of the Diocese of Thérouanne from 1379, keeping an ecclesiastical tie with France. The town came to be called the 'brightest jewel in the English crown' owing to its great importance as the gateway for the tin, lead, cloth and wool trades (or 'staples'). Its customs revenues amounted at times to a third of the English government's revenue, with wool being the most important element by far. Of its population of about 12,000 people, as many as 5,400 were recorded as having been connected with the wool trade. The governorship or Captaincy of Calais was a lucrative and highly prized public office; the famous Dick Whittington was simultaneously Lord Mayor of the City of London and Mayor of the Staple in 1407.