Ferdinand III of Castile (1201-1252), also known as "the Saint", was a key figure in medieval Spanish history.
Prince Ferdinand, son of Alfonso IX and Berenguela of Castile, was born in Peleas de Arriba, in the province of Zamora, in 1201. He inherited the throne of Castile from his mother, Queen Berenguela, and was proclaimed king in Valladolid in 1217 (Martínez Díez, 1993).