Usan Joyl was an elder Duros male who was an infamous con artist and identity forger. By 44 ABY, he and his grandson, Dashan, were imprisoned by corrupt Galactic Alliance General Stavin Thaal within the lower levels of the Vandor-3 Caridan animal exhibit from where Thaal ran his criminal operations throughout the galaxy. During the Joyls' imprisonment, Thaal used the elder Joyl for his identity-forging talents in order to create his new persona of Thadley Biolan, which he would use to retire from the military.