Rest in Peace, Lisa Barnett.

From Locus Online:
Fantasy writer Lisa A. Barnett, born 1958, died this morning at her home in Portsmouth, New Hampshire, from brain tumor. She and her partner Melissa Scott published three fantasy novels together, The Armor of Light (1988), Point of Hopes (1995), and Point of Dreams (2001), the last of which won a Lambda Literary Award in 2002.
I really liked Point of Hopes when I read it some years ago. Astrology and Magic in a Renaissance-Europe like setting! I had no idea when I read it that there was a prequel (Armor), the book stood very well on its own.