Arvold Rooker is a member of the Lucian Alliance.
Various years ago he hired Vala Mal Doran to execute a job that went wrong. Some time later Vala incursioned on his home on Aldan-3 and retrieved a Data Disk. Arvold managed to confront Vala, and as Vala escaped, he declared her an official enemy of the Lucian Alliance. (SG1: "Vala Mal Doran 1")