Henry VII needed them out of the way, but he got so scared whenever a pretender appeared that it is likely that he knew they were alive at the time Richard died at Bosworth.

CNN: STORY HIGHLIGHTS

Challenged by Henry Tudor, Richard was killed at Bosworth in 1485 after only two years on the throne.

BBC: Richard III dig: DNA confirms bones are king's

Richard died at the battle of Bosworth in 1485, at the hands of forces loyal to the future Henry VII.

BBC: Richard III buried in 'hastily dug untidy grave'