Dagol, The Prince of Darkness. The name Dagol doesn't appear in any other grimoires or demonology books that I could find. His ‘Prince of Darkness' designation leads one to believe it could be another name for satan himself, however the demon Belial also bears that title. Though the source is quite old, it isn't as old as it purports to be and was likely created for resale as a rare book, not as a genuine grimoire. Compendium Of Demonology and Magic, 1775.