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.
Isabel Neville, Duchess of Clarence to England's heir presumptive, George Plantagenet, 1st Duke of Clarence, the brother of both King Edward IV and Richard, Duke of Gloucester (later Richard III). The king opposed the marriage as it would bring the already powerful Earl of Warwick too close to the throne. However the ceremony took place in secret at Calais on 11 July 1469, conducted by Isabel Neville's uncle George Neville, archbishop of York. Following their marriage Clarence joined forces with Warwick and allied with the Lancastrians led by Margaret of Anjou, queen consort to Henry VI. After Isabel Neville's sister Anne was married to Edward