Nerthus, ancient Germanic goddess known from a report of her given by the Roman historian Tacitus, who in his Germania (late 1st century ad) refers to her as Terra Mater, or Mother Earth, and says that she was worshiped by seven tribes (among whom were the Angles, who later invaded England). Her worship centred on a temple in a sacred grove on an island in the Baltic Sea. She was believed to enjoy coming among her people, riding in a chariot pulled by cows. Her presence was discerned by her priest, and while she was among them her people lived in peace, with no war or fighting and much rejoicing. When she returned to her temple, she and her chariot were washed in a sacred lake by slaves, who were then drowned in the lake.

Her name is to be identified with that of Njörd, who, however, was a god. Thus, her sex is questionable, and she may have been hermaphroditic. Many elements of her ritual can be seen in later Germanic religion.

Earth Mother, in ancient and modern nonliterate religions, an eternally fruitful source of everything. Unlike the variety of female fertility deities called mother goddesses (q.v.), the Earth Mother is not a specific source of vitality who must periodically undergo sexual intercourse. She is simply the mother; there is nothing separate from her. All things come from her, return to her, and are her.

The most archaic form of the Earth Mother transcends all specificity and sexuality. She simply produces everything, inexhaustibly, from herself. She may manifest herself in any form. In other mythological systems she becomes a more limited figure. She becomes the feminine Earth, consort of the masculine sky; she is fertilized by the sky in the beginning and brings forth terrestrial creation. Even more limited reflections of the Earth Mother occur in those agricultural traditions in which she is simply the Earth and its fertility.