The siege of Jaén was the final siege on the city during the Spanish Reconquista. The siege, was carried out from 1245 through 28 February 1246 by forces of the Crown of Castile and the Order of Santiago commanded by Ferdinand III of Castile and the Grand Master of the Order of Santiago, Pelayo Pérez Correa, against a combined defending force of the local Taifa of Jaén (جيان) and the Emirate of Granada under Muhammad I. The battle resulted in a Castilian victory with the city of Jaén being handed over to the Crown of Castile and Leon after the signing of the Treaty of Jaén.