Princes in the Tower act stated that Edward IV and Elizabeth Woodville's marriage was invalid because of Edward's pre-contract of marriage with Lady Eleanor Butler. Gloucester was crowned King Richard III of England on 3 July. The declaration of the boys' illegitimacy has been described by Rosemary Horrox as an ex post facto justification for Richard's accession. Dominic Mancini, an Italian friar who visited England in the 1480s and who was in London in the spring and summer of 1483, recorded that after Richard III seized the throne, Edward and his younger brother Richard were taken into the "inner apartments of the Tower" and
Princes in the Tower among others. It has also been suggested that one or both princes may have escaped assassination. In 1487, Lambert Simnel initially claimed to be Richard, Duke of York, but later claimed to be Edward Plantagenet, 17th Earl of Warwick. From 1491 until his capture in 1497, Perkin Warbeck claimed to be Richard, Duke of York, having supposedly escaped to Flanders. Warbeck's claim was supported by some contemporaries (including the aunt of the disappeared princes, Margaret of York). In 1674, workmen at the Tower dug up a wooden box containing two small human skeletons. The bones were found in a box