The Sworn Book of Honorius is one of the earlier grimoires in the western European tradition. The name refers to the vow of secrecy and discretion that owners of the book were expected to maintain.
This grimoire influenced the grimoire Heptameron
John Dee owned this grimoire.
Timeline of related events
1300
1500
1555
John Dee arrested for casting horoscopes (owned this grimoire)1558
John Dee becomes an advisor to Queen Elizabeth (owned this grimoire)