Kaca, the son of the learned celestial priest Bṛhaspati, had been a student of Śukrācārya, from whom he had learned the art of reviving a man who has died untimely. This art, called mṛta-saṣjīvanī, was especially used during wartime. When there was a war, soldiers would certainly die untimely, but if a soldier’s body was intact, he could be brought to life again by this art of mṛta-saṣjīvanī. This art was known to Śukrācārya and many others, and Kaca, the son of Bṛhaspati, became Śukrācārya’s student to learn it. Devayānī desired to have Kaca as her husband, but Kaca, out of regard for Śukrācārya, looked upon the guru’s daughter as a respectable superior and therefore refused to marry her. Devayānī angrily cursed Kaca by saying that although he had learned the art of mṛta-saṣjīvanī from her father, it would be useless. When cursed in this way, Kaca retaliated by cursing Devayānī never to have a husband who was a brāhmaṇa. Because Devayānī liked Yayāti, who was a kṣatriya, she requested him to accept her as his bona fide wife. Although this would be pratiloma-vivāha, a marriage between the daughter of a high family and the son of a lower family, she explained that this arrangement was made by providence.