I was just watching an episode of Angela’s Symposium:

In this, she discusses the Book of Enoch (specifically 1Enoch, or the “Ethiopic Book of Enoch) and its influence on John Dee. This is something I explore in depth in my books (I think especially in The Angelical Language, Vol I). In case you are not familiar, I discuss in that work how the mythos of 1Enoch became the basis for Dee’s Enochian system. However, as that text was considered long-lost in Dee’s time (it wouldn’t be re-discovered until the 17th century), I had always assumed the story had simply survived orally until it reached Dee.

But I was wrong! At the time I published, I was not aware of a man named Guillaume Postel (d. 1581 – the year before Dee began his angelic workings). Dee knew Guillaume, and Guillaume actually had a copy of the Ethiopic Book of Enoch!