Princes in the Tower of 14; both had predeceased the King. However, two lead coffins clearly labelled as George Plantagenet and Mary Plantagenet were subsequently discovered elsewhere in the Chapel (during the excavation for the royal tomb house for King George III under the Wolsey tomb-house in 1810–13), and were moved into the adjoining vault of Edward IV's, but at the time no effort was made to identify the two lead coffins already in Edward IV's vault. In the late 1990s, work was being carried out near and around Edward IV's tomb in St George's Chapel; the floor area was excavated to replace an
Princes in the Tower of Scotland. After a failed attempt to invade England he was captured. He retracted his claims, was imprisoned and later executed. Many modern historians believe he was an imposter, whose supporters accepted his claim for political reasons. The fact that two persons claimed to be Richard led the 18th century writer Horace Walpole to argue that Richard had in fact escaped death, and that Warbeck genuinely was Richard, a view also supported by Malcolm Laing. Walpole, however, later retracted his views and stated that he now believed the princes to have been murdered by Richard III to secure his hold