Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Isabel Neville, Duchess of Clarence:

"

Isabel Neville married George Plantagenet, 1st Duke of Clarence, in Calais, France, on 11 July 1469. Four children resulted:[1]

  • Edward Plantagenet, 17th Earl of Warwick (25 February 1475 – 28 November 1499). Executed by Henry VII for attempting to escape from the Tower of London.[6]
  • Richard of Clarence (5 October 1476 – 1 January 1477),[7] born at Tewkesbury Abbey, Gloucestershire, died at Warwick Castle, Warwickshire, buried Warwick.[citation needed]