Background
He was the son of Esteban Fernández de Castro, Lord of Lemos and Sarria, and Alzonza Rodríguez de León. His maternal grandparents were Rodrigo Alfonso de León, son of Alfonso IX of León, and Ines Rodríguez Cabrera.
He was the son of Esteban Fernández de Castro, Lord of Lemos and Sarria, and Alzonza Rodríguez de León. His maternal grandparents were Rodrigo Alfonso de León, son of Alfonso IX of León, and Ines Rodríguez Cabrera.
Following the death of his father, Esteban Fernández de Castro, Fernando became In 1304, Fernando took up arms against Ferdinand IV of Castile, by attacking Philip of Castile, who was in Galicia besieging the fortress of Monforte de Lemos. However, no agreement was reached and Fernando Rodriguez de Castro was killed in the ensuing battle.
He was one of the most powerful and influential nobles of Galicia, like most members of the House of Castro.