This was named after Charles V of the Holy Roman Empire (and I of Spain).[15][16][17] The southern island of Sarangani was renamed by Villalobos as Antonia, in honor of Antonio de Mendoza y Pacheco, the Viceroy of New Spain who commissioned Villalobos expedition to the Philippines.[4] Villalobos also named the littoral zone between the islands of Samar and Leyte as Tendaya.[18]