Edward IV of England Richard, Duke of Gloucester (later King Richard III of England), were married to Isabel Neville and Anne Neville. Both were daughters of Warwick by Anne Beauchamp and rival heirs to the considerable inheritance of their still-living mother, leading to a dispute between the brothers. In 1478 George was eventually found guilty of plotting against Edward, imprisoned in the Tower of London, and privately executed on 18 February 1478. According to a long-standing tradition, he was "drowned in a butt of Malmsey wine". Edward did not face any further rebellions after his restoration, as the Lancastrian line had virtually been extinguished.
George Plantagenet, 1st Duke of Clarence ultimately failed and Warwick was killed in battle of Barnet April 1471. The re-instated King Edward IV restored his brother Clarence to royal favour by making him Great Chamberlain of England. As his father-in-law had died, Clarence became "jure uxoris" Earl of Warwick, but did not inherit the entire Warwick estate as his younger brother, Richard, Duke of Gloucester, had married () Anne Neville, who had been widowed in 1471. Edward intervened and eventually divided the estates between his brothers. Clarence was created first Earl of Warwick on 25 March 1472. In 1475 Clarence's wife Isabel gave birth to a