Juan Alfonso de la Cerda (France, 1295 - August 7, 1347) was Lord of Gibraleón, Huelva, Real de Manzanares and Deza.[1]
He was the grandson of Alfonso de la Cerda. He married Maria Alfonso de Portugal (illegitimate daughter of King Denis of Portugal).
He took part in Alfonso XI siege of Algeciras, which culminated in the city's surrender in 1344.