In the early Vedic religion, Vritra (Sanskrit: वृत्र (Devanāgarī) or Vṛtra (IAST)) "the enveloper", was an Asura and also a "naga" (serpent) or possibly dragon-like creature, the personification of drought and enemy of Indra. Vritra was also known in the Vedas as Ahi ("snake"), and he is said to have had three heads.