("hill of Caesar"). The name evolved in the 4th century when the original Gallic name, Turones, became "Civitas Turonum", and then "Tours". It was at this time that the Tours Amphitheatre was built. Tours became a metropolis in the Roman province of Lugdunum towards 380–388 AD, dominating Maine, Brittany, and the Loire Valley. One important figure in the city was Saint Martin of Tours, a bishop who shared his coat with a naked beggar in Amiens. The importance of Martin in the medieval Christian West made Tours, and its position on the route of pilgrimage to Santiago de Compostela, a major centre during the Middle Ages. Middle Ages In the 6th century Gregory of Tours, author of the Ten Books of History, restored a cathedral destroyed by a fire in 561. Saint Martin's monastery benefited from its inception, at the very start of the 6th century from patronage and support from the Frankish king, Clovis I, which increased considerably the influence of the saint, the abbey and the city in Gaul. In the 9th century, Tours was at the heart of the Carolingian Rebirth, in particular because of Alcuin, an abbot of Marmoutier Abbey. In 732, Abdul Rahman Al Ghafiqi and an army of Muslim horsemen from Al-Andalus advanced deep into France, and were stopped at Moussais-la-Bataille (between Châtellerault and Poitiers) by Charles Martel and his infantry. This ignited the Battle of Tours. The Muslim army was defeated, preventing an Islamic conquest of France. In 845, Tours repelled the first attack of the Viking chief Haesten. In 850, the Vikings settled at the mouths of the Seine and the Loire. Still led by Haesten, they went up the Loire again in 852 and sacked Angers, Tours and Marmoutier Abbey. During the Middle Ages, Tours consisted of two juxtaposed and competing centres. The "City" in the east, successor of the late Roman 'castrum', was composed of the cathedral and palace of the archbishops as well as the castle of Tours. The castle of Tours acted as a seat of the authority of the Counts of Tours (later Counts of Anjou) and the King of France. In the west, the "new city" structured around the Abbey of Saint Martin was freed from the control of the city during the 10th century (an enclosure was built towards 918) and became "Châteauneuf". This space, organized between Saint Martin and the Loire, became the economic