There was a pious King called Vangasvana. He was childless and performed the Agnishtuta Yajna to please God Agni and the latter, having been amply appeased, granted not one, not two, not even three, but a hundred sons (mind you, no daughters) to the Rajarshi. Now, it so happened that the Yajna in question was directed towards satisfying Lord Agni alone. And this fact pissed off no less a God than Indra himself. He was mad as hell. (See how mean and envious these Gods were? Always counting curses! So, to take it out on poor Vangasvana, he created a magic spell and made the chap lose his way. He was tired as hell and landed near a lake.