Simnel originally appeared in Ireland (where the Yorkist faction were popular) and it's pretty unlikely he was one of the princes - he was too young, about 10. He first claimed to be Warwick - the son of Edward IV and Richard III's brother, Clarence. Unfortunatly Warwick was in the tower and Henry was able to parade him through the streets of London. He's easy to dismiss, but one must then question why he had so much support? It ended with the Battle of Stoke, which ended the Wars of the Roses proper. He was supported by the Earl of Lincoln, who was the son of Elizabeth Plantagenet, and had been designated Richard III's heir, following the death of Edward of Middleham. Why would a reasonable claimant, who was an adult moreover, support an obvious pretender? It's posible he was a stalking horse for one of the real princes. The rebellion was also supported by the Queen Dowager - why would she want to supplant her daughter as queen to put up a pretender? Her allowance was cut and she was shoved off into a nunnery where she eventually died and was given a frugal burial - particularly considering her status!

Warback was more plausible as a pretender - he certainly bore some resemblance to Edward IV - it's possible he was an illegitimate son? It's puzzling that he knew so many things and 'acted' the part so well, he gained the suport of his 'aunt', Margaret of Burgundy. He eventually suffered a traitors death, after spending time in the tower, as he was accused of conspiring with Warwick to escape - Warwick was beheaded.