title: Bilbao
context: Ancient walls, which date from around the 11th century, have been discovered below the Church of San Antón.[40] Bilbao was one of the first towns founded in the fourteenth century, during a period in which approximately three-quarters of the Biscayan cities were developed, among them Portugalete in 1323, Ondarroa in 1327, Lekeitio in 1335, and Mungia and Larrabetzu in 1376.[41] Diego López V de Haro, then third Lord of Biscay, founded Bilbao through a municipal charter dated in Valladolid on 15 June 1300 and confirmed by King Ferdinand IV of Castile in Burgos, on 4 January 1301. Diego López established the new town on the right bank of the Nervión river, on the grounds of the elizate of Begoña and granted it the fuero of Logroño, a compilation of rights and privileges that would prove fundamental to its later development.[42]
question: When was Bilbao founded?
answers: fourteenth century