Shiva Purana
आयुताजित्सुतस्त्वासीदृतुपर्णो महायशाः ॥ दिव्याक्षहृदयज्ञोऽसौ राजा नलसखोऽभवत् ॥ ११॥
His son was king Ṛtuparṇa, who knew the secret of the dice and was a friend of king Nala.
english translation
AyutAjitsutastvAsIdRtuparNo mahAyazAH ॥ divyAkSahRdayajJo'sau rAjA nalasakho'bhavat ॥ 11॥
hk transliteration by Sanscript