The Little Book of Black Venus (Olympic Spirits, the Cult of the Dark Goddess, and the Seal of Ameth)
This is a long article so I will simply link it. It links John Dee and other occultists of the 16 cent. with a pagan undercurrent, and the Olympic spirit sigils of the Arbatel directly with prehistoric petroglyphs of a Central European culture. Great read for anyone interested in European esoteric traditions.