According to Hindu scripture, the Tulsi plant was a woman named Vrinda (Brinda; a synonym of Tulsi). She was an incarnation of the Goddess Lakshmi. She was married to the Asura king Jalandhar, who due to her piety and devotion to Vishnu, became invincible. Even Devtas could not defeat Jalandhar, so they requested Vishnu - the preserver in the Trinity - to find a solution. When leaving for war Vrinda promised Jalandar for doing Sankalpa for his victory till he returns but Lord Vishnu disguised himself as Jalandhar and she saw him ,she left her sankalp and touched his feet.