Isolde Blackthorne

Lady Isolde Blackthorne was the daughter of Lord Lamorak Blackthorne by his wife Morgwyna Monmoth. With her elder and younger sisters, she comprised the She-Griffins Three, who helped to run the Blackthorne war effort against Brecilidia. Isolde was considered the most intelligent of the sisters, with a prodigious knowledge of economics and histories that almost rivalled her cousin Allister. In addition to her academic skills, Isolde was a talented tactician in planning for battles. It was frequently rumoured that she had inherited the Blackthorne family's talent for sorcery, which would have branded her a Witch, but the accusations never took substantial root and she never faced opposition for them. 
When the She-Griffins were pushed from power while Allister was elevated, Isolde left alongside her sisters and mother. They went to Morgwyna's homeland of Crystantheum, and began to plan their next move. Isolde and Evaine had always quarelled, relying on Ygraine to balance their differing temperaments, but this time their negotiations fell through and as their aging mother ailed the sisters split up. Isolde went to the city-state of Volmark where her looks endeared her to the leading Autarch, while her talents with his banks made him substantially richer. She became his favourite and most flaunted concubine and birthed several of his baseborn children; a descendant of her daughter would go on to marry Daffyd Monmoth, father of Yven and Alyssa Monmoth, and tehreafter be folded back into the main Blackthorne line many hundreds of years later.
Isolde lived in supreme luxury til her death in 565AE; she was buried along with the Autarch and his three other concubines, though her tomb was placed closest to his, denoting her position as his favourite.