The wife of Lord Nampentenis in Eilhart’s Tristrant.
She was loved by Tristan’s half-brother Kahedins. Nampentenis kept her locked in a castle tower surrounded by walls and moats; however, she made wax impressions of the keys and gave them to Kahedins, who fashioned duplicate keys and used them to gain access. When Nampentenis found out about their tryst, he attacked Kahedins and Tristan, killing the one and mortally wounding the other.
She is known in Palamedes as Gargeloain.
Source
Tristrant | Eilhart von Oberge, 1170–1190