Poseidon

Poseidon is the chaotic god of the Healer pantheon.

Encyclopedia entry

Poseido(o)n, lord of the seas and father of rivers and
fountains, was the son of Chronos and Rhea, brother of Zeus,
Hades, Hera, Hestia and Demeter. His rank of ruler of the
waves he received by lot at the Council Meeting of the Gods,
at which Zeus took the upper world for himself and gave
dominion over the lower world to Hades.
Poseidon is associated in many ways with horses and thus is
the god of horses. He taught men how to ride and manage the
animal he invented and is looked upon as the originator and
guardian deity of horse races.
His symbol is the familiar trident or three-pronged spear
with which he can split rocks, cause or quell storms, and
shake the earth, a power which makes him the god of
earthquakes as well. Physically, he is shown as a strong and
powerful ruler, every inch a king.

[ The Encyclopedia of Myths and Legends of All
          Nations, by Herbert Robinson and Knox Wilson ]