NIGHTBRINGER | The Arthurian Encyclopedia

Talebre

Colezebre, Conlotebre, Conlouzebre, Contolebre, Talebiere, Zelegebres

Arthur summoned the barons of Carmelide (Cameliard) to this city when he acknowledged Genievre, alias “the false Guenevere,” as his queen.

Presumably it would have been in or near Cameliard.