The Real Warwick -- After King Richard's death in 1485, Edward, Earl of Warwick was kept a prisoner by Henry VII because of his claim to the throne could be a threat to the new King. He remained in the Tower of London until the arrival Perkin Warbeck, in 1499. An unsuccessful escape attempt resulted in the execution for treason of both men.

LAMBERT SIMNEL (The first prentender)

Impostor who first claimed to be Richard, Duke of York (younger son of Edward IV) and then changed his claim to be Edward, Earl of Warwick (nephew of Edward IV). Was crowned Edward VI in Dublin, Ireland, prompting Henry VII to parade the real Earl of Warwick through the streets of London. His troops were defeated by Henry VII's at the Battle of Stoke. Afterwards worked in Henry VII's kitchens.

Perkin Warbeck (The Second Pretender)

Perkin Warbeck (possibly an illegitimate son of Edward IV) also claimed to be Edward, Earl of Warwick but soon changed his story and claimed to be Richard, Duke of York - the brother of Edward V and the younger Prince in the Tower. Jane mentions that Warbeck took shelter in Beaulieu Abbey. I have linked to the abbey, which unfortunately does not give an accout of this incident.