The Ur-Quan Xen-Weyi Guard was a Guard of space faring aliens put in place by the Ur-Quan Kzer-Za to guard over the Xen-Weyi race. This guard was comprised of 2 of the 3 robotic races of the Mother-Ark space craft. These two races that comprised it were the Foon-Foon and the Baul.
This affiliation began in the 17000s BCE and ended eventually after the Lurg tricked the Baul into Attacking the Foon-Foon. The Melnorme are also willing to reward those that give themselves information about pre-historic cultures as such that the Xen-Weyi and the rest of the Guard were.