Catherine

Catherine is the ex-fiance of Athos and the lover of his younger brother, Thomas. After Milady de Winter (back then known as Anne) murdered him when he was going to force himself upon her, Catherine came to hate Anne and vowed vengeance. She took residence in Athos' family home even staying there after Anne burnt it down.

Catherine met d'Artagnan, who was a close friend of Athos'. There, Athos revealed that Milady still lived and was alive. This infuriates Catherine, causing her to slap Athos.

In The Accused, she goes to Paris and finds Anne wandering the streets. Catherine attempted to murder Milady by hanging her but Athos stopped his former lover from comitting the act, leaving the former lover of Athos to be confused and without her vengeance.