King Sagara, an ancestor in the same Ikshvaku dynasty that would eventually produce Rama, sought to perform the Ashwamedha yagna, the horse-sacrifice ritual through which a king demonstrated unchallenged sovereignty by releasing a horse to wander freely and claiming any territory it passed through unopposed. Sagara had two wives, and one of them, Sumati, had borne him sixty thousand sons through an unusual and rapid multiplication, while the other, Keshini, bore him a single son, Asamanjasa, whose own line would eventually include Bhagiratha.
A horse that vanishes underground
During the ritual, the sacrificial horse disappeared – stolen, in most tellings, by Indra, who felt threatened by the scale of Sagara’s ambition in performing the sacrifice and sought to disrupt it before it could be completed successfully. Sagara dispatched his sixty thousand sons to search the entire earth for the missing horse, and their search eventually led them to dig deep into the ground itself, excavating so extensively in their determination to find it that they eventually broke through into the netherworld.
A sage disturbed at the worst possible moment
There, they found the horse grazing peacefully beside the meditating sage Kapila, and, assuming without further investigation that the sage himself had stolen it, the sixty thousand princes rushed at him in fury, ready to attack. Kapila, disturbed from his deep meditation by the sudden assault, opened his eyes and, in a single glance carrying the accumulated force of his spiritual power, reduced all sixty thousand sons to ash instantly – an entire generation of a royal line destroyed in one moment of misdirected aggression against a sage they should have approached with caution rather than violence.
Ashes that could not simply be buried
The souls of the sixty thousand sons, reduced to ash, could not attain proper release or peace through ordinary funeral rites, since their remains required purification by the waters of the celestial Ganga specifically – a river that existed only in heaven at that time, with no path down to earth where the ashes actually lay. This impossible requirement passed down through successive generations of the family, each ruler attempting and failing to bring the heavenly river down to earth, until it finally fell to Bhagiratha, several generations later, to succeed where his ancestors could not – undertaking extraordinary penance to persuade both Brahma to release the river and Shiva to break its fall through his own hair, ultimately bringing Ganga down to earth and allowing the ashes of Sagara’s sixty thousand sons to finally receive the release they had waited generations for.
A single moment’s cost, carried for generations
The scale of the story – sixty thousand princes lost to a single glance, and generations more required to finally undo the consequence – functions as one of the Puranas’ starkest illustrations of how quickly unchecked aggression, even in pursuit of a legitimate goal, can produce devastation vastly disproportionate to its original cause, and how long the burden of correcting it can end up falling on descendants who had no part in the original mistake at all.