Catherine of Aragon [SEP] noble family
barred from succession to the English throne, the Tudor monarchy was not accepted by all European kingdoms. At the time, the House of Trastámara was the most prestigious in Europe, due to the rule of the Catholic Monarchs, so the alliance of Catherine and Arthur validated the House of Tudor in the eyes of European royalty and strengthened the Tudor claim to the English throne via Catherine of Aragon's ancestry. It would have given a male heir an indisputable claim to the throne. The two were married by proxy on 19 May
Leo X awarded him the title "Fidei Defensor" (Defender of the Faith). However, the king came into conflict with the papacy when he wished to annul his marriage with Catherine of Aragon, for which he needed papal sanction. Catherine, among many other noble relations, was the aunt of Emperor Charles V, the papacy's most significant secular supporter. The ensuing dispute eventually lead to a break from Rome and the declaration of the King of England as head of the English Church. England would later experience periods