Golgoth

Golgoth was a primorial god-figure, worshipped by the Mondasian Silurians and Sea Devils, it resembled a Sea Devil. (DWM: Cybermen: The Dead Heart)

It is possible the Golgoth is a Great Old One named Dagon, and ancestor of the Silurians and Sea Devils.It is unknown if the Silurians and Sea Devils on Earth worship Golgoth as well.