One of the most prolific authors of all times, writer of over 200 novels, selling over 100 million copies & translated into over 20 languages.
I have been a fan of Jean Plaidy novels since I was a teen. I learned a great deal of history from these novels & from reading the history & biographical books she listed in her bibliographies. I also enjoyed Victoria Holt novels but I was never a great fan of gothic novels. Her other novels I have never read; some of those pen names are unknown to me. Perhaps they are published in Britain only. But if I ever happen to see one, I will certainly snap it up.
From The Lady in the Tower

Plaidy, Jean. The Lady in the Tower: The Story of Anne Boleyn. NY: Three Rivers Press, 1986. Excerpt found on page 148.