The author (or authors) of the Livre d'Artus of the Vulgate Merlin used both the prose Lancelot and the Perlesvaus in what he says about Lohot.  He takes the account of how he was begotten, Sommer, Vulgate Version of the Arthurian Romances, II, 124, from the former—the account of his death, ibid., 316, from the latter.  So in this work Arthur on Merlin's advice makes the acquaintance of Lisanor, whose father (now dead) was Seuain, lord of the castle of Canparcorentin.  She came to do homage to Arthur and he begot on her Lohot... (Romantic Review, Todd, v.3, 1912)