As the War of the Roses dragged on, it appeared that the House of York would succeed, on 21 May 1471 Henry VI of England died and Edward IV seemed victorious, however a descendent of Edward III through the Beaufort family called Henry Tudor became the Lancaster claimant. After the usurpation of England by Richard III and the death of Edward IV's sons, Henry Tudor claimed the throne. Richard III died and Henry became king, however John of Gaunt made it clear that the Beauforts and their descendants won't be able to succeed. Thus Henry had to marry Edward IV's daughter Elizabeth. Henry VII was a great monarch, he was good with foreign realms, increased the economic power of England and served justice. His son Arthur was married to the Spanish princess Catherine, however Arthur died of an ill