Condwiramurs Tilly is a sorceress; a graduate of one of magical academies - most likely Aretuza. At the academy, she was the best at dream interpretation. At the age of 24, she was invited by Nimue verch Wledyr ap Gwyn to help solve the puzzles surrounding Ciri's story.
In The Witcher 3: Wild Hunt, Corinne Tilly aids Geralt in Novigrad during his search for Ciri. She could be related to Condwiramurs.