Agonius or Enagonius was an epithet

Epithet

An epithet or byname is a descriptive term accompanying or occurring in place of a name and having entered common usage. It has various shades of meaning when applied to seemingly real or fictitious people, divinities, objects, and binomial nomenclature. It is also a descriptive title...

 of several gods in Greek mythology

Greek mythology

Greek mythology is the body of myths and legends belonging to the ancient Greeks, concerning their gods and heroes, the nature of the world, and the origins and significance of their own cult and ritual practices. They were a part of religion in ancient Greece...

 (or a distinct deity). Aeschylus

Aeschylus

Aeschylus was the first of the three ancient Greek tragedians whose work has survived, the others being Sophocles and Euripides, and is often described as the father of tragedy. His name derives from the Greek word aiskhos , meaning "shame"...

 and Sophocles

Sophocles

Sophocles is one of three ancient Greek tragedians whose plays have survived. His first plays were written later than those of Aeschylus, and earlier than or contemporary with those of Euripides...

 use it of Apollo

Apollo

Apollo is one of the most important and complex of the Olympian deities in Greek and Roman mythology...

 and Zeus

Zeus

In the ancient Greek religion, Zeus was the "Father of Gods and men" who ruled the Olympians of Mount Olympus as a father ruled the family. He was the god of sky and thunder in Greek mythology. His Roman counterpart is Jupiter and his Etruscan counterpart is Tinia.Zeus was the child of Cronus...

, and apparently in the sense of helpers in struggles and contests, or possibly as the protectors of soldiers. But Agonius is more especially used as an epithet of Hermes

Hermes

Hermes is the great messenger of the gods in Greek mythology and a guide to the Underworld. Hermes was born on Mount Kyllini in Arcadia. An Olympian god, he is also the patron of boundaries and of the travelers who cross them, of shepherds and cowherds, of the cunning of thieves, of orators and...

, who presides over all kinds of solemn contests , such as the Agonalia

Agonalia

In Ancient Roman religious tradition, Agonalia, or Agonia, was a festival celebrated several times a year, in honor of various divinities, such as Janus and Agonius, whom the Romans used to invoke upon their undertaking any business of importance...

. Classical scholar William Warde Fowler

William Warde Fowler

William Warde Fowler was an English historian and ornithologist, and tutor at Lincoln College, Oxford. He was best known for his works on ancient Roman religion....

 thought it likely the deity or the epithets were merely inventions of the pontifices

Pontiff

A pontiff was, in Roman antiquity, a member of the principal college of priests . The term "pontiff" was later applied to any high or chief priest and, in ecclesiastical usage, to a bishop and more particularly to the Bishop of Rome, the Pope or "Roman Pontiff".-Etymology:The English term derives...

.

According to a 19th century catalog of Greek and Roman art in the Vatican Palace, there was in that building a statue considered by the museum's curator to be that of Hermes Enagonius, dated to the time of Lysippos

Lysippos

Lysippos was a Greek sculptor of the 4th century BC. Together with Scopas and Praxiteles, he is considered one of the three greatest sculptors of the Classical Greek era, bringing transition into the Hellenistic period. Problems confront the study of Lysippos because of the difficulty of...

, although other critics have variously believed the statue to depict Heracles

Heracles

Heracles ,born Alcaeus or Alcides , was a divine hero in Greek mythology, the son of Zeus and Alcmene, foster son of Amphitryon and great-grandson of Perseus...

, Theseus

Theseus

For other uses, see Theseus Theseus was the mythical founder-king of Athens, son of Aethra, and fathered by Aegeus and Poseidon, both of whom Aethra had slept with in one night. Theseus was a founder-hero, like Perseus, Cadmus, or Heracles, all of whom battled and overcame foes that were...

 or Meleager

Meleager

In Greek mythology, Meleager was a hero venerated in his temenos at Calydon in Aetolia. He was already famed as the host of the Calydonian boar hunt in the epic tradition that was reworked by Homer....

.

"Agonius" was also the original name of the Quirinal Hill

Quirinal Hill

The Quirinal Hill is one of the Seven Hills of Rome, at the north-east of the city center. It is the location of the official residence of the Italian Head of State, who resides in the Quirinal Palace; by metonymy "the Quirinal" has come to stand for the Italian President.- History :It was...

 in Rome

Rome

Rome is the capital of Italy and the country's largest and most populated city and comune, with over 2.7 million residents in . The city is located in the central-western portion of the Italian Peninsula, on the Tiber River within the Lazio region of Italy.Rome's history spans two and a half...

.