Alonso Meléndez de Guzmán

His paternal grandparents were Alvar Pérez de Guzmán and his wife María González Girón.

Alonso's sister was Leonor de Guzmán, the lover of Alfonso XI of Castile.

His other sister, Juana de Guzmán married Enrique Enríquez "el Mozo" of Villalba de los Barros and head adelantado of Andalucia who was famous for commanding the Castilian army at the Battle of Linuesa.

He was named by the personal intervention of King Alfonso XI of Castile as head of the Order of Santiago.

Alonso de Guzman fought with king Peter I of Aragon, also known as "Peter the Cruel", in the reconquista of the Kingdom of Algeciras but was later assassinated by the king who named the infant Fadrique Alfonso de Castilla Grand Master.