In his Five Books of Mystery, John Dee describes his communications with angels (particularly the angel Uriel), and the process he goes through to discover the names of previously unknown angels, which he finds in letter grids and confirms with Uriel. This system, which bears a passing resemblance to the game boggle, accounts for the phonological divergence of the names found in this book, compared to conventional angel names.
Och is listed as an angel here, rather than as an Olympian spirit, as in Arbatel.
This grimoire mentions the grimoire Book of Soyga
Olympian spirits (1)
Timeline of related events
1527Birth of John Dee (wrote this grimoire)
1555John Dee arrested for casting horoscopes (wrote this grimoire)
1558John Dee becomes an advisor to Queen Elizabeth (wrote this grimoire)
1582John Dee and Edward Kelley meet (wrote this grimoire)
1608Death of John Dee (wrote this grimoire)