Story of Vajradatt
Vajradatt was the son of the great King Bhagadatt. After the Kurukshetr war, Yudhisthir performed the Ashwamedh Yagn. Vajradatta stopped the sacrificial horse and challenged the Pandav's supremacy. Arjun fought and eventually defeated Vajradatt after a fierce and long battle. After this, Arjun let him go as part of Yudhishthir's policy of avoiding bloodshed and promoting peace