The Post-Vulgate mentions a knight of the Round Table named Dinadas of Garlot

Book nine of Malory features Dinadan, and that book corresponds to the Vulgate "Tristan" [British Museum, Harl. 4398, Add. 23929 and Harl. 49; plus seven printed editions, listed in Sommer, p. 9, part I, ff. 69-154 and part II, ff. 1-19].