[Source] Cregennan (also Cragen) of Lod was a mighty human sorcerer, most famous for falling in love with an elf, Lara Dorren, and for being murdered for it by humans. Their daughter, Riannon, was adopted by Cerro, the queen of Redania. Cregennan was one of the ancestors of Ciri. The Aen Elle considered his relationship with Lara a theft of their heritage, and the king of the Aen Elle, Auberon Muircetach was determined to take back that stolen heritage, by using Cregennan's descendent, Ciri, to produce an heir.