According to the chronicles of Alfonso III of Asturias; the first reference to the name "Castile" (Castilla) can be found in a document written during AD 800. The name reflects its origin as a march on the eastern frontier of the Kingdom of Asturias, protected by castles, towers or castra. When Ferdinand I died in 1065, the territories were divided among his children. Sancho II became King of Castile, Alfonso VI, King of León and García, King of Galicia, while his daughters were given towns, Urraca, Zamora, and Elvira, Toro.