The unpopularity of Henry VI's counsellors and his consort, Margaret of Anjou, as well as his own ineffectual leadership, led to the weakening of the House of Lancaster. The Lancastrians faced a challenge from the House of York, so called because its head, a descendant of Edward III, was Richard, Duke of York, who was at odds with the Queen. Although the Duke of York died in battle in 1460, his eldest son, Edward IV, led the Yorkists to victory in 1461, overthrowing Henry VI and Margaret of Anjou. Edward IV was constantly at odds with the Lancastrians and his own councilors after his marriage to Elizabeth Woodville, with a brief return to power for Henry VI. Edward IV prevailed, winning back the throne at Barnet and killing the Lancastrian heir, Edward of Westminster, at Tewkesbury. Afterwards, he captured Margaret of Anjou, eventually sending her into exile, but not before killing Henry VI while he was held prisoner in the Tower. The Wars of the Roses, nevertheless, continued intermittently during his reign and those of his son Edward V and brother Richard III. Edward V disappeared, presumably murdered by Richard. Ultimately, the conflict culminated in success for the Lancastrian branch led by Henry Tudor, in 1485, when Richard III was killed in the Battle of Bosworth Field.