Jaci

Also Known As: also Iaci, Jacy, Yacy and Iacy; from Old Tupi îasy, “moon”, the same word that gives îasytatá, “star”
Region/Culture: South America
Mythos: Native Brazilian Mythology, Brazilian Mythology
Primary Type/Nature: Gods and Deities
Mythical Attributes: She is the moon itself rather than a ruler of it, and what she touches she changes, turning chosen girls into stars and coaxing the night-blooming plants open.
Role in Mythos: She keeps the sky lit while the sun sleeps and presides over growing things, lovers and the hours after dark.
Relation to Humans: She watches the village from directly overhead and takes an interest in individual people, particularly young women, which is presented in the stories as an honour and a danger at once. Those who go looking for her tend not to come back in the shape they left in.

The flowers of the giant water lily open after dark, white and heavy, throwing off a scent closer to pineapple than to anything else in the water. By the time the sun has cleared the treeline they have turned pink and begun to shut. The reason given along the Amazon is not botanical. A girl is remembering what she used to be, and the person who put her there was watching from directly overhead.

Jaci is the moon. Not a deity who steers the moon or lives on it, but the moon understood as somebody, with preferences and moods and a habit of taking an interest. In Old Tupi the word for the moon is îasy, and the word for a star is îasytatá, which unpacks into something near moon-fire. A language that builds its stars out of its moon has already told half the story that follows.

She comes up over the igarapé while the village sleeps and the water goes from black to pewter. Insects stop, or seem to. She moves along the row of thatched roofs and finds the girls, the cunhantãs, and goes from face to face laying light on each one, and she is not being sentimental about it. She is choosing.

The elders knew what the choosing meant and they said so plainly. A girl taken up behind the hills lost her blood and her flesh on the way, and what arrived in the sky was light. That warning did nothing for Naiá, who wanted it. She spent her nights climbing after the moon and never closing the distance, and by day she would not eat, and no pajé could talk her out of it. She got thin. She kept going.

One night she stopped at the edge of a lake to rest, and there was the moon lying flat on the surface, whole, close enough to put a hand through. She went in after it and drowned. Whatever Jaci felt about that, the answer was not to give the girl back. Naiá was made into a different kind of star, one that stays down here, rooted in the mud with its leaves spread out across the water, opening only at night. Amazonian tellers call the vitória-régia the star of the waters, and the flower’s habit of blushing at sunrise is the part of the story nobody has to be told.

Where Jaci came from depends on who is telling it. The commonest account starts with Guaraci, the sun, who grew tired of his eternal shift and shut his eyes, and the world went dark, so the moon was made to hold the night open until he woke. In some versions she is his sister and in others his wife, and because the two of them can never occupy the same sky, a third figure, Rudá, was sent back and forth between them carrying love.

That tidy arrangement has an author and a date. General José Vieira Couto de Magalhães published O Selvagem in Rio de Janeiro in 1876, a book of Nheengatu legends with a Tupi grammar attached, and it is there that the three superior gods appear in a row: the sun, the moon, and love. It is there too that Jaci’s name is split into ja and cy and glossed as mother of fruits, or mother of everything born out of the soil. The dictionaries do not back him. In Old Tupi îasy is one word and it means the moon. The etymology is his, not the language’s. Later writers have queried the whole scheme, and the honest position is that Couto de Magalhães was organising something real into a shape it did not have before he got there. The moon in the villages is older than his system and considerably less symmetrical.

What she can do follows from what she is. She transforms, and the transformation is one-way: girls into stars, a drowned girl into a plant. Nothing she touches goes back to being what it was. Her light is credited with pulling growth out of the ground, which is why planting and cutting were timed to her phases across a great deal of Brazil, and why the tradition that reaches us calls her the protector of plants, of lovers, and of the reproduction of anything at all. The night is hers in the ordinary sense as well. She is the reason the forest at three in the morning is navigable rather than solid.

Her limits are the same list read backwards. She cannot come down and stay, so everything she does to a person is done at a distance and cannot be undone at close range. She could not stop Naiá going into the water, only decide afterwards what the girl would become, which is the difference between a rescue and a consolation. She cannot share the sky with the sun, and in the tellings that make them lovers this is the whole tragedy, two beings who light the same world in shifts and never once at the same time. And every month she loses her body and has to build it back out of nothing, going dark, going thin, going gone, then starting again, which no one in the stories treats as a weakness so much as the price of the job.

The vitória-régia is still there in the still water off the main channel, leaves the size of a dinner table with their rims turned up, and the flowers still open white and close pink. The goddess arranged into a pantheon is younger than she looks. The moon that comes down and takes people is not.

Frequently Asked Questions

Who is Jaci in Brazilian mythology?

Jaci is the moon in Tupi and Amazonian tradition, understood as a person rather than an object. Her name is simply the Old Tupi word for the moon, îasy. She is best known for descending at night to choose girls from the villages and carry them up into the sky as stars.

What is the legend of Jaci and the giant water lily?

A girl named Naiá longed to be chosen by Jaci and turned into a star, and spent her nights chasing the moon across the hills until she stopped eating and wasted away. Seeing the moon reflected in a lake, she dived in after it and drowned. Jaci made her into a different kind of star, the vitória-régia, whose flowers open white at night and turn pink at sunrise.

Is Jaci the wife of Guaraci?

In the commonest telling Jaci is the wife or sister of Guaraci, the sun, and the two can never be in the sky together, so the figure Rudá carries love between them. That arrangement comes from the scheme of three superior gods set out by Couto de Magalhães in 1876 rather than from any older record, and later writers have disputed it.

Was Jaci really a goddess of the ancient Tupi?

The word Jaci is genuinely old and genuinely means the moon, and stories of a moon who takes people are widespread in the Amazon. The neat pantheon in which she sits as one of three superior gods, with the name reinterpreted as mother of fruits, was assembled by a single Brazilian author in 1876 and is contested. The figure is older than the system built around her.