A count defeated by Arthur’s Sir Tandareis.
He loved the maiden Claudin and served her faithfully for many years. Fed up with her continual dismissals, he kidnapped and abused her. Tandareis encountered them and defeated Kalubin to save the maiden.
Later, through Tandareis’s negotiations, Kalubin and Claudin were wed.
Source
Tandareis and Flordibel | Der Pleier, 1240-1270