After the formation of the dynastic union between the Kingdoms of Castile and Aragon under the Catholic Monarchs, the title was favoured by the Hispanic (Spanish) King, who by custom applied it in the same way, i.e. to his heir apparent. For generations the kingdom's crown prince accumulated the titles "Prince of Asturias, Girona, Spain and the New World", modifying those of the earlier regnant Habsburgs: "Prince of these Kingdoms, Prince of the Spains and the New World" ("Príncipe de estos Reynos, príncipe de las Españas y del Nuevo Mundo"). When the Bourbons acceded to the Spanish throne in 1705, the title was retained following the decisive help of Castile to the house in the War of the Spanish Succession. At the beginning of the 19th century, the Spanish Constitution of 1812 (European year of revolutions) with consent of its counterparties ascribed the title to the heir of the Crown. The Constitutions within the following decades temporarily removed the synonymy between the title and position as heir to the Crown; before being reinstated and recited in the second half of the 19th century, first half of the 20th century, and on the restoration of the monarchy (under parliamentary predominance) in 1978.