House of Trastámara
Duke of Gandía (, ) is a title of Spanish nobility that was first created in 1399 by Martin of Aragon and granted to Alfonso of Aragon and Foix. It has its origin in the lordship of Gandía created in 1323 by James II of Aragon. Later, having no direct descendants, the title passed from the House of Aragon to the House of Trastámara.