| || The assembled sorcerers parted, bowing with respect at the personages entering the hall. The first was a middle aged but vigorous man in extremely modest woollen clothing. At his side strode a tall, sharp-featured woman with dark, smoothly combed hair.
"That is Gerhart of Aelle, also known as Hen Gedymdeith, the oldest living sorcerer," Yennefer informed Geralt in hushed tones.
|- pg. 117, Time of Contempt (UK edition)|
| || Marti Södergren, the healer, was sitting in the window alcove. Hearing his footsteps, she raised her head. Her cheeks were wet with tears.
"Hen Gedymdeith is dead," she said in a faltering voice. It was his heart. I couldn't do a thing ... Why did they call me so late? Sabrina hit me. She hit me in the face. Why? What has happened?"
|- pg. 174, Time of Contempt (UK edition)|
According to this compendium of in-universe information, Hen Gedymdeith was author of The Legends of the Elder Races where he described tales about Aen Elle.