Ulūka (Uluka) was the son of Vala, in the lineage of Kuśa (Kusa), son of Rāmacandra (Ramachandra)belonging to the Ikṣvāku(Ikshwaku) dynasty. Ulūka had a son called Vajranābha (Vajranabha).

Brahmāṇḍapurāṇa (Maharṣi)(2.63.205)