The bold but wicked Duke of Montikluse. He made it his hobby to imprison knights in his Malmort Tower, leaving them to starve.
He captured Arthur’s Sir Tandareis when the latter was defending a maiden named Claudin against a force of Kandalion’s knights. Unlike his previous victims, Tandareis was kept alive through the graces of Antonie, Kandalion’s sister, and was released three times to attend, incognito, tournaments at Arthur’s court, in which he defeated Kandalion.
Kandalion eventually released Tandareis to claim a reward offered by Arthur for his return.
Source
Tandareis and Flordibel | Der Pleier, 1240-1270