Grannus

Grannus, a minor celtic god and a Goa'uld and one of Camulus' former lieutenants. He was executed by his own Jaffa after the demise of the Goa'uld following the successful Jaffa uprising.

One of the things you could worship him at was at the Monestary's Ring of Shen Marak, as told by Caius. (SG1: "The Ties That Bind")