Castor and Pollux- Roman GodDeity"Protectors of Sailors"

Sons of Two Fathers

Jupiter came to Leda as a swan. From that union she bore two eggs, and from the eggs came four children: Pollux and Helen were Jupiter's, Castor and Clytemnestra were fathered by Leda's mortal husband Tyndareus. So the twins shared a womb but not a nature. Pollux could not die. Castor could.

They grew up inseparable. Castor broke horses no one else could ride. Pollux fought with his fists and never lost. They sailed on the Argo with Jason and brought their sister Helen home when Theseus stole her. Through all of it they fought side by side, the mortal twin and the immortal one, as though the difference did not exist.

The Battle of Lake Regillus

In 496 BCE, Rome faced the Latin League at Lake Regillus. The dictator Aulus Postumius Albus vowed a temple to the twins if they delivered him victory. The battle turned when two horsemen appeared at the front of the Roman cavalry. They were young, taller than any soldier there, mounted on white horses. They drove straight into the Latin line and broke it.

The fighting was still going on at the lake when the same two riders appeared in the Roman Forum, twenty miles away. Their horses were lathered. They dismounted at the spring of Juturna, watered the animals, and told the crowd that Rome had won. Then they were gone.

The Spring of Juturna

Postumius built the temple where they had stood, at the southeast end of the Forum beside the spring. Three of its columns still stand. The Senate met there. Magistrates kept Rome's official weights and measures inside it. On its steps, citizens swore oaths and heard legal judgments.

Romans swore by the twins constantly. Men said "Edepol!" (By Pollux!) and women "Ecastor!" (By Castor!), a gendered division so ingrained that Plautus and Terence used it to mark characters by sex. The twins were not distant gods. They were the words in people's mouths.

The Transvectio

Every July 15, the young men of the equestrian order rode through the Forum in the Transvectio Equitum. They wore purple-bordered togas and olive wreaths, riding past the temple in pairs. The parade was a tribute to the divine horsemen who had once charged at the head of Rome's cavalry. Dionysius of Halicarnassus described it as already ancient by the late Republic.

Castor's name came first in the temple's title, and Romans sometimes called both twins "the Castors." He was the horseman of the pair. Breeders and trainers of horses invoked him before races and before war.

Fire on the Mast

Sailors knew the twins by a different sign. During storms, a pale glow sometimes appeared on the tips of masts and yardarms. Pliny called it a manifestation of the Dioscuri. One light meant danger: that was Helen, their sister. Two lights meant the storm would pass: the twins had come.

Horace, sending Virgil across the Adriatic, prayed to Castor and Pollux to guard the ship. Merchants left offerings at harbor temples before sailing and again when they returned. The constellation Gemini, with its two bright stars named for the brothers, guided navigators across the open sea.

One in Light, One Below

The twins quarreled with their cousins Idas and Lynceus over two women, Phoebe and Hilaeira. In the fight that followed, Lynceus drove a spear through Castor. Pollux killed Lynceus, and Jupiter struck down Idas with a thunderbolt. But Castor was already dying.

Pollux, unwounded and unable to die, asked Jupiter to let him share his immortality. Jupiter offered him a choice: Olympus forever, alone, or half his days in the underworld with his brother. Pollux chose the underworld. From then on they alternated, one twin above and one below, never both in the light at the same time. The two stars of Gemini rise and set in turn, and the Romans saw in that rhythm the brothers keeping their bargain.