In some cases forests were ruled by goddesses--that of the Ardennes by Dea Arduinna, and the Black Forest, perhaps because of the many waters in it, by Dea Abnoba.[134] While some goddesses are known only by being associated with a god, e.g. Kosmerta with Mercury in Eastern Gaul, others have remained separate, like Epona, perhaps a river-goddess merged with an animal divinity, and known from inscriptions as a horse-goddess.[135] But the most striking instance is found in the grouped goddesses. Of these the _Deoe Matres_, whose name has taken a Latin form and whose cult extended to the Teutons, are mentioned in many inscriptions all over the Celtic area, save in East and North-West Gaul.[136] In art they are usually represented as three in number, holding fruit, flowers, a cornucopia, or an infant. They were thus goddesses of fertility, and probably derived from a cult of a great Mother-goddess, the Earth personified. She may have survived as a goddess Berecynthia; worshipped at Autun, where her image was borne through the fields to promote fertility, or as the goddesses equated with Demeter and Kore, worshipped by women on an island near Britain.[137] Such cults of a Mother-goddess lie behind many religions, but gradually her place was taken by an Earth-god, the Celtic Dispater or Dagda, whose consort the goddess became. She may therefore be the goddess with the cornucopia on monuments of the horned god, or Aeracura, consort of Dispater, or a goddess on a monument at Epinal holding a basket of fruit and a cornucopia, and accompanied by a ram's-headed serpent.[138] These symbols show that this goddess was akin to the _Matres_. But she sometimes preserved her individuality, as in the case of Berecynthia and the _Matres_, though it is not quite clear why she should have been thus triply multiplied. A similar phenomenon is found in the close connection of Demeter and Persephone, while the Celts regarded three as a sacred number. The primitive division of the year into three seasons--spring, summer, and winter--may have had its effect in triplicating a goddess of fertility with which the course of the seasons was connected.[139] In other mythologies groups of three goddesses are found, the Hathors in Egypt, the Moirai, Gorgons, and Graiæ of Greece, the Roman Fates, and the Norse Nornæ, and it is noticeable that the _Matres_ were sometimes equated with the Parcæ and Fates.[140]