Philippa Jones (The Other Tudors) writes of how it was widely believed that he was actually the illegitimate son of Henry VIII by Mary Berkeley, who served Catherine of Aragon, Henry VIII's first wife, but others dispute this claim, saying that there is no evidence to support this.
I did a Claire Chats video "Was Sir John Perrot Henry VIII's son?" in which I look at Perrot's life and the evidence regarding his parentage. Click here to view the video now.