Named probably for the legendary ancestress of the noble family of Lusignan of the 10th century, a heroine of French romance. She married a knight on the condition that he was never to see her on Saturday. But his curiosity led to the discovery that she was half snake. Thereupon she took the form of a dragon and flew away to reappear as an omen before the death of her descendants. The town of Lusignan is supposed to be named for her. (H 41) _ _.