I have just started reading AFTER ELIZABETH, by Leanda de Lisle, and I have found something I have never come across before. She mentions very early on that Henry VIII had an illegitimate daughter named Ethelreda. I knew about Henry Fitzroy, and the arguments that Mary Boleyn's two children may have been fathered by Henry. But I have never heard of Ethelreda. Henry never acknowledged her? What is known about her? Were there other children fathered by Henry that were not acknowledged by him? Where did Ms. de Lisle find out about Ethelreda?
[She has popped up in other threads about possible bastards of Henry VIII, which I've linked to below. There are a lot of other discussions on this site about unacknowledged children of Henry VIII which can be found by searching on "bastard", "illegitimate", "mistress", etc. - Lara]