John I of Castile
Fighting for John I of Castile, he participated in the Battle of Atoleiros where he was defeated by his brother, Nuno Álvares Pereira, and was one of the few survivors from the Castilian army. In the Battle of Aljubarrota he led a Castilian charge against the Portuguese rearguard, but he died soon after while running away from his brother's army.