Sancto m. Latin sanctus 'consecrated, blessed; a saint'.
The name of a 10th C king of Leon, an 11th C king of Leon, Castile, and Galicia, a 12th C king of Castile, a 12th C king of Portugal, a 13th C king of Leon, Castile, and Galicia, a 13th C king of Portugal, and a 14th C king of Majorca.