Yennefer of Vengerberg (born on Belleteyn of the year 1173) was a sorceress who lived in Vengerberg, the capital city of Aedirn. She was the youngest member of the Brotherhood of Sorcerers and later the Lodge of Sorceresses attempted to recruit her.
She was Geralt of Rivia's true love and a mother figure to Ciri, a former royal advisor to king Demavend of Aedirn, and a close friend of Triss Merigold.