I'm currently writing a book about Catherine de' Medici. Catherine was a brilliant mathematician and avid astrologer; she and Nostradamus, aka Michel de Nostredame, were pretty tight. A self-reliant sort, Catherine learned to cast her own charts -- obliging me to learn about astrology as it was practiced in her day.
A beautiful, informative, impressive and fascinating site dealing with the subject is Christopher Warnock's Renaissance Astrology. If this is your cup of tea, please check it out.
