Hierax was a Spartan

Spartan Army

The Spartan army was the military force of Sparta, one of the leading city-states of ancient Greece. The army stood at the centre of the Spartan state, whose citizens' primary obligation was to be good soldiers. Subject to military drill from infancy, the Spartans were one of the most feared...

 admiral during the Corinthian War

Corinthian War

The Corinthian War was an ancient Greek conflict lasting from 395 BC until 387 BC, pitting Sparta against a coalition of four allied states; Thebes, Athens, Corinth, and Argos; which were initially backed by Persia. The immediate cause of the war was a local conflict in northwest Greece in which...

. In 389 BC he was dispatched by Sparta

Sparta

Sparta or Lacedaemon, was a prominent city-state in ancient Greece, situated on the banks of the River Eurotas in Laconia, in south-eastern Peloponnese. It emerged as a political entity around the 10th century BC, when the invading Dorians subjugated the local, non-Dorian population. From c...

 to Aegina

Aegina

Aegina is one of the Saronic Islands of Greece in the Saronic Gulf, from Athens. Tradition derives the name from Aegina, the mother of Aeacus, who was born in and ruled the island. During ancient times, Aegina was a rival to Athens, the great sea power of the era.-Municipality:The municipality...

, to take over the Spartan fleet. The Spartans under the command of Teleutias

Teleutias

Teleutias was the brother of the Spartan king Agesilaus II, and a Spartan naval commander in the Corinthian War. He first saw action in the campaign to regain control of the Corinthian Gulf after the Spartan naval disaster at Cnidus in 394 BC, and was later active in the Spartan campaign against...

 had earlier driven off the Athenian fleet blockading Aegina. Soon after taking command, Hierax departed for Rhodes

Rhodes

Rhodes is an island in Greece, located in the eastern Aegean Sea. It is the largest of the Dodecanese islands in terms of both land area and population, with a population of 117,007, and also the island group's historical capital. Administratively the island forms a separate municipality within...

 with most of the fleet, leaving Gorgopas

Gorgopas (4th Century BC)

Gorgopas was a Spartan commander during the Corinthian War. In 388 BC Hierax was dispatched by Sparta to Aegina to take over the Spartan fleet. The Spartans under the command of Teleutias had earlier driven off the Athenian fleet blockading Aegina...

, his vice-admiral, with twelve triremes as governor in Aegina.

Not long afterward, Antalcidas

Antalcidas

Antalcidas was a Spartan soldier and diplomat, the son of Leon.In 393 BC he was sent to Tiribazus, Persian satrap of Sardis, to undermine the friendly relations then existing between Athens and Persia, offering to recognize Persian claims to the whole of Asia Minor and supremacy over Greek cities...

was sent to replace Hierax as admiral.