Poseidon

Poseidon was the god of the sea and earthquakes in Greek mythology. He was one of the sons of the Titan Cronos and brother to Hades and Zeus.

Original Timeline
Poseidon is a central figure of the Temple of Poseidon underneath Alexandria in the catacombs. Temple of Poseidon hides the secret entrance to the Library of Alexandria.

Legend Timeline
His room appears in Tomb Raider: Anniversary.