Nalakubera and Manigriva were sons of Kubera. One day they got drunk and lost their temper at the sight of some apsaras. When Narada came on the way, the apsaras quickly put on something, Nalakubera and Manigriva stood naked in front of him.
He cursed them to become an Arjuna twin tree, Yamalarjuna. In a hundred years Krishna would redeem them.