Anvagbhānu (Anvagbhanu) is another name of Ṛceyu (Richeyu), son of Raudrāśva (Raudraswa), who was the third son of Puru. Ṛceyu was so powerful, and such was his glorious prowess as a Kṣatriya (Kshatriya), it seemed that even Sūrya (Surtya)or Bhānu (Bhanu; the Sun) followed his radiant ways. The commentator, Nīlakaṇṭha (Nilakantha) has written,
ataeva etasya tejovāhulyena
sūryeṇāpyanugatatvāt anvagbhānurityapi nāma.
He is also known as Anādhṛṣṭi (Anadhrishti) and Ṛceyu.
[See Anādhṛṣṭi]