One of Arthur’s knights.
A magical mantle brought to Arthur’s court revealed that Kailet’s wife was displeased with the way he always took her with him wherever he went.
Ulrich probably took the name from Hartmann von Aue’s Gahillet. The name was taken by Wolfram as Kaylet.
Source
Lanzelet | Ulrich von Zatzikhoven, c. 1200