A Force-sensitive Zabrak, Mennaus was trained in the ways of the Force by the Jedi Order, and resided on the ancestral Jedi homeworld Tython with the rest of the Order the following the Great Galactic War and the resurgence of the Sith Empire. Exploring the Tythonian Gnarls with fellow Padawans Jerridan and Avitla in hopes of passing their Trials of Knighthood, the group was slowed when Flesh Raiders attacked and injured Jerridan. When his companions sought to take revenge on the raiders for their attack, Mennaus stressed the Jedi philosophy warning against passion and aggression.