Themis was born as the second daughter among the twelve Titans, the eldest of the three races born to Gaia (Mother Earth) and Ouranos (Father Sky). She, her sisters and her eldest brother Oceanus, all refused to take part in Kronos' usurpation and subsequent castration of Ouranos.
Life in the Golden Age
Themis developed a good reputation with her brothers and sister, mediating even the worst arguments with exception of Kronos eating his children with Rhea, in which Themis failed.
Marriage and Council to Zeus
After the Olympians became the rulers of the universe, Zeus married Metis, a niece of Themis through Okeanos. However, Zeus swallowed a pregnant Metis in fear of a prophecy in which their son would overthrow him. Though Themis wasn't interested in marriage, she became Zeus' second wife in order to preserve peace, as none other Titaness wanted to marry him. Themis bore Zeus two pairs of triplets: the Horai (Eunomia, Dike and Eirene; goddesses of the seasons), and then the Moirai (Klotho, Lachesis and Atropos; the Fates). The Moirai were already born as elderly women and had powers superior to the gods, which horrified both of their parents. Fearing the prospect of having even more intimidating children with Themis, Zeus advocated to end their marriage, to which she agreed.
Though no longer married to Zeus, Themis continues provide counsel to the King of the Gods. She established law, order and custom among both the gods and mortals, organizing communal affairs and setting the stage for human civilization to develop. According to Homer's Iliad, Themis is charged with calling the gods to assembly on Mount Olympus.
Themis informed Zeus that the Nereid Thetis, whom he and Poseidon had both been trying to woo, was fated to give birth to a son who would be more powerful than his father. She suggested to Zeus that he should have Thetis marry a mortal.
According to Percy Jackson's Greek Gods, Themis was wise, thoughtful, quiet, and modest. She tries to not draw attention to herself and isn't interested in marriage, but in order to maintain peace, became Zeus' second wife as none other Titaness besides Metis wanted to marry him.
Themis always wears a simple shawl over her hair.
- Divine Judgement: Themis realized from an early age that she had a natural sense of right and wrong. She understands what is fair and what isn't. Whenever she is in doubt, she claims she can draw wisdom from the earth. Themis established the laws all gods and mortals should follow. She constantly gave advices to the titans and the gods.
- Titanic Energy: Like all Titans, Themis has the ability to blast things hundreds of yards away from herself with a yell or a wave of the hand.
- Titanic Divine Form: As a Titaness, Themis has the ability to incinerate any being lesser than a god/Titan only by being present.
- Tongue of the Old Times fluency: According to Tyson, this is the ancient language that Gaea spoke to the Titans, Elder Cyclops and Hekatonkheires before the birth of the Olympian gods. Hence, Themis understands and speaks it perfectly.
Themis developed a good relationship with her niece Hestia, who resembles her in personality. Hestia considers Themis her favourite aunt.
Her name is derived from the Greek verb τίθημι (Greek títhēmi, “to put”), referring to her putting into place both law and order.
- Out of the Elder Titanesses, only Themis and Mnemosyne had children with Zeus.
- Furthermore, Themis and Mnemosyne are the only Elder Titanesses who didn't marry one of their siblings.