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https://lovecraft.fandom.com/wiki/Dagon
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Dagon is a deity who presides over the Deep Ones, an amphibious humanoid race that currently resides in the Earth's oceans. He was first introduced in Lovecraft's short story "Dagon", and is mentioned extensively throughout the mythos. Also known as Father Dagon and the consort of Mother Hydra, although they are Deities, they are generally not considered Great Old Ones.

He is worshipped by the Esoteric Order of Dagon, a secret cult based in Innsmouth.
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