The Bodhisatta was once a king’s personal warhorse, and he lived a life far more luxurious than most humans. His food was served in a golden dish worth one hundred thousand coins and his stall was perfumed with the four odors and decorated with crimson curtains and flower garlands.
One time seven kings from nearby lands surrounded the kingdom where the Bodhisatta lived and ordered his king to surrender or face war. The king discussed strategy with his advisors and they decided the best course of action was to send out their top charioteer to battle all seven armies by himself. If this method failed, then they would consider a different plan. The charioteer, with the Bodhisatta and his brother pulling him, fought heroically and had captured five of the kings and brought them back to the palace as prisoners, but after capturing the sixth, the Bodhisatta was wounded.
The charioteer rode back to the palace gate and started to put armor on another horse. When the Bodhisatta saw this, he thought to himself that no other horse was anywhere near as good as he; if he didn’t return to battle, the knight and the king would surely be slain and the kingdom would fall. So he told the charioteer to bind his wound to stop the bleeding and then he rode out again and captured the final king.
His kingdom saved, the king came out to greet them. The Bodhisatta implored the king to not kill the seven captured kings, but to make them swear an oath to never wage war on him again. Then, after telling the king to rule with righteousness and charity for the rest of his days, the Bodhisatta died.
In the Lifetime of the Buddha
One of the Buddha’s disciples had given up in his quest to fully understand dharma and the Buddha told him this story as motivation. After hearing it, the disciple became an arahant.
The king was an earlier birth of Ananda, one of the Buddha’s top disciples.