Buddhist Dictionary of Pali Proper Names by G P Malalasekera
Dīparājā
Dīparājā:A king of Nāgadīpa,son of a king of Ceylon by a younger queen.The king granted the queen a boon and she claimed the kingdom for her son.But the prince was blinded in one eye while watching a cock fight and the king refused to grant the request.So he made him king of Nāgadīpa,whence he came to be known as Dīparājā (VibhA.443f).