Pedro Alfonso de León
Pedro Alfonso de León (c. 1196 – 1226) was a Leonese Spanish noble of the House of Burgundy. He was, according to many historians, the illegitimate son of Alfonso IX of León. He was elected Grand Master of the Order of Santiago in 1225, succeeding Fernán Pérez Chacín in the role. Biography. His exact date of birth is not known, but is estimated to be around 1196. There is also controversy amongst historians surrounding his true identity. Some chroniclers hold that he was the illegitimate son of Alfonso IX of León and an unknown woman, while others  maintain that his mother was Aldonza Martínez de Silva, daughter of Martín Gómez de Silva and his wife Urraca Ruiz de Cabrera. Still other historians have cast doubt on Pedro Alfonso's status as Alfonso IX's illegitimate son, that he existed at all or that he was a Grand Master of the Order of Santiago. Marriage and descendancy. The name of his wife is not known, and historians disagree over whether Pedro Alfonso had one or two children. His children were as follows.