The reason why scholars and anthropologists are so certain that the ancient Proto-Indo-Europeans had Dioscuri-like gods is that divine twins can be found in so many of the cultures descended from them. For example, the Vedic cultures who kicked it what we call India today, had some dudes called the Ashvins. These horse-headed twins are mentioned in the Rigveda, one of Hinduism's most ancient and most sacred Sanskrit texts.