That's not true at all. I have long thought Margaret Beaufort had something to do with the disappearance and I only heard about Phillipa Gregory a couple of years ago. So, you know, thanks for assuming.
Two anonymous 17th Century ballads describing the purported evil deeds of Richard III, the murder of the Princes in the Tower, and the Battle of Bosworth Field, which was fought #onthisday in 1485.
A good example of Tudor propaganda.
A song of the Life and Death of King Richard the Third (to the tune of Who list to lead a soldier's life)
and
The most cruel murther of Edward the fifth, and his brother Duke of York, in the Tower; by their Uncle Richard Duke of Gloucester (to the tune of Fortune my foe)
From Richard Johnson's ballad miscellany, The Golden Garland of Princely Delights, 1620