Two entries with the name Alibel.
Alibel
Alibeax, Calibians, Calibiaus, Caltbiaus
A strong knight who served King Claudas of Gaul, fighting in Claudas’ war against Arthur. His brothers were Brumand (Brumant), Canart, and Cadant.
The Vulgate says Caltbiaus is the natural son of King Claudas.
Source
Prose Tristan | 1230-1240
Alibel
A Knight of the Round Table who participated in the Grail Quest.
Source
Prose Tristan | 1230-1240