Arvold Rooker was 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")
He hired the bounty hunter Shrike to capture Vala. (SG1: "Vala Mal Doran 2")
Shrike contacted Arvold and replied that after killing Vala, he would be going after Arvold. (SG1: "Vala Mal Doran 4")