Named for a sea god who could change shape at will, Proteus is a moon of this planet
[DOC] [TLE] Proteus, a moon of Jupiter - Triton, the adopted moon of Neptune [PAR] Proteus, the second largest moon of Neptune next to Triton, was discovered by 
the ... One, it orbits so close to Neptune, that the reflective glare of the planet itself 
... Proteus is named for the shape shifting sea god son of Poseidon  Poseidon ... 
Proteus of mythology was said to have the ability to change his shape at will.