According to Max Müller and A. Kuhn, Demeter is the mythological equivalent of the Sanskrit Saranyu, who, having turned herself into a mare, is pursued by Vivasvat, and becomes the mother of Revanta and the twin Asvins, the Indian Dioscuri (the Indian and Greek myths being regarded as identical).
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In Rigveda 10.17, Saranyu is the daughter of Tvastar, and, like Helen, is abducted, and Vivasvat is given a replacement bride instead.