Mine was based on a series of documentaries shown on the BBC in the 1980's that proposed historical documents had been altered during the end few months of the War of the Roses. Allegedly after Richard III died, tragically after winning a great victory at Bosworth Field.
Henry Tudor fled, barely escaping with his life, and Richard was succeeded by his nephew Richard IV. His reign was very short, and despite trying to establish himself with various methods including manipulation of the Church, and foreign marriages it all failed when he and his hold family were killed and poisoned by agents of Henry Tudor, who assumed the throne and had history re-told to put him in a better light and more acceptable to the people.
However it was rumoured that his younger son (who was severely tortured as well as poisoned) had illegitimate offspring who may have come to the surface a couple of times, historically speaking, most notably during the Elizabethan reign, during the Regency and then the First World War.
All very interesting and true.
Honest.