Shiva Purana
उत्तानपादोऽजनयत्पुत्राञ्छक्रसमान्प्रभुः ॥ ध्रुवं च तनयं दिव्यमात्मानंदसुवर्चसम्॥ ७ ॥
Lord Uttānapāda begot sons equal to Indra. He begot another son Dhruva of divine nature who had the excellent lustre and the inner bliss.
english translation
uttAnapAdo'janayatputrAJchakrasamAnprabhuH ॥ dhruvaM ca tanayaM divyamAtmAnaMdasuvarcasam॥ 7 ॥
hk transliteration by Sanscript