Ferdinand I of Portugal
Garci died in 1370 during the Castilian siege of Ciudad Rodrigo which was defended by the Portuguese forces of Ferdinand I of Portugal during the Ferdinand Wars. His estate at Oropesa was inherited by his son Fernán Álvarez de Toledo y Loaysa. His estate and title at Valdecorneja went to his brother Fernán Álvarez de Toledo y Meneses, beginning the bloodline of the Dukes of Alba.