Poitiers [pwatje] ( listen) is a city on the Clain river in west central France. It is a commune and the capital of the Vienne department and of the Poitou-Charentes region. The centre is picturesque and its streets are interesting for predominant remains of historical architecture, especially from the Romanesque period. Two major military battles occurred near the city: in 732, the Battle of Poitiers (also known as the Battle of Tours), in which the Franks commanded by Charles Martel halted the expansion of the Umayyad Caliphate, and in 1356, the Battle of Poitiers, a key victory for English forces during the Hundred Years' War.