Alfonso IX of León
Pedro Fernández de Castro "the Castilian" (18 August, 1214, Morocco) was a Castilian nobleman, son of Fernando Rodríguez de Castro and Estefanía Alfonso la Desdichada (Stephanie "The Unfortunate"). He inherited the "Infantazgo" of León from his parents and was "mayordomo mayor" of Fernando II and his son Alfonso IX of León.