Saint Ferdinand III (5 August 1199 – 30 May 1252), was the King of Castile from 1217 and King of Galicia and Leon from 1230. He was the son of Alfonso IX of León and Berenguela of Castile. Through his second marriage he was also Count of Aumale. He finished the work done by his maternal grandfather Alfonso VIII and consolidated the Reconquista. In 1231, he permanently united Castile and Galicia-León. He was canonized in 1671 and, in Spanish, he is Fernando el Santo or San Fernando.