Grannus

From The Stargate Omnipedia

A minor Celtic god, Grannus was a Goa'uld lieutenant of Camulus. Presumably after Camulus's defeat, Grannus managed to get himself killed by his own Jaffa. A monastery is still maintained in his name, where the monks who remain are extremists now more than ever, since the god they worship is dead.

KEY EPISODE

The Ties That Bind - When SG-1 visits a monastery of Grannus, Vala and her associate, Caius, praise the Goa'uld's name while conducting business undercover.