Cecily Neville in the context of Margaret of York

George Plantagenet, Duke of Clarence (21 October 1449 – 18 February 1478), was the sixth child and third surviving son of Richard Plantagenet, 3rd Duke of York, and Cecily Neville, and the brother of English kings Edward IV and Richard III. He played an important role in the dynastic struggle between rival factions of the Plantagenets now known as the Wars of the Roses.

Though a member of the House of York, he switched sides to support the House of Lancaster, before reverting to the Yorkists. He was later convicted of treason against his elder brother, Edward IV, and executed, allegedly by drowning in malmsey wine. He appears as a character in William Shakespeare's plays Henry VI, Part 3 and Richard III, in which his death is attributed to the machinations of Richard.

Edmund, Earl of Rutland (17 May 1443 – 30 December 1460), was the fourth child and second surviving son of Richard Plantagenet, 3rd Duke of York, and Cecily Neville. He was a younger brother of Edward, Earl of March, the future King Edward IV who came to the throne in 1461, the year after Edmund's death. He was born in Rouen, then the capital of English-occupied France and his father held the office of Lieutenant of France. He was killed at the age of 17 either during or shortly after the Battle of Wakefield, during the Wars of the Roses.

He was created Earl of Rutland by King Henry VI probably at some time before 1454, aged about 11, as Edmund and his elder brother Edward signed a letter to their father on 14 June 1454 as "E. Rutland" and "E. Marche". No record of the creation survives.