House of Lancaster to members of the family and their supporters. The family provided England with three kings: Henry IV, who ruled from 1399 to 1413, Henry V (1413–1422), and Henry VI (1422–1461 and 1470–1471). The House became extinct in the male line upon the murder in the Tower of London of Henry VI, following the battlefield execution of his son Edward of Westminster, Prince of Wales, by supporters of the House of York in 1471. Lancastrian cognatic descentfrom John of Gaunt and Blanche of Lancaster's daughter Phillipacontinued in the royal houses of Spain and Portugal while the Lancastrian political cause was maintained
Cham–Vietnamese War (1471) and once their economies recovered, these two kingdoms went to war again. When fighting resumed in 1471, the Champa kingdom found itself weakened and isolated. It has experienced numerous civil wars and, at one point, had five different rulers. For its earlier attack on Angkor, the Khmers ignored the Cham's request for assistance when Vietnam invaded. The Cham also requested Ming China to intervene by helping bring the Vietnamese back in line by force and demarcate the border between Champa and Vietnam. China, however, only verbally rebuked the Vietnamese for its incursion, which the Vietnamese ignored, proceeding with its attack