The Duros individual Thes Cilgris acquired the Birthright, a freighter of the modified Barloz-class, in the final years of the Galactic Republic. This freighter was subsequently piloted by Thes' offspring, Yett Cilgris, throughout the Galactic Civil War. Furthermore, around the period of the Yuuzhan Vong War, the Birthright was under the control of Naul Cilgris, who was Thes' nephew.