Nuevo Cartago y Costa Rica was a province of the Kingdom of Guatemala, created in 1540 during the reign of Charles V, Holy Roman Emperor. It was formed from two earlier Spanish territories. The first of these was Royal Veragua, the territories on the Caribbean coast that had been part of Columbian Veragua before the creation of the Duchy of Veragua in 1537 for Admiral Luis Colón y Toledo, namely present-day Nicaragua, Costa Rica and part of Panama. The second was the Pacific coast that had constituted Castilla de Oro, namely from the Gulf of Nicoya on the west to the borders of the Duchy of Veragua.