Two entries with the name Celice.
Celice
A damsel of the Lady of the Lake.
She is called Saraide (Seraide) in other parts of the story.
Source
Lancelot do Lac | 1215-1220
Celice
Celise, Colice
A river in the forest of Darnantes in Britain.
Joseph of Arimathea came to it with his followers, but could not find a way to cross. He prayed, and God provided him with a bridge. One follower, Canaan, was still unable to cross, betraying his lack of faith and later sin.
The castle of Celis lay on its shores.
Sources
Vulgate Queste del Saint Graal | 1215-1230
Vulgate Estoire del Saint Graal | 1220-1235