|Canto 9: Liberation||Chapter 20: The Dynasty of Pūru|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 9.20.6
ṛteyo rantināvo 'bhūt
trayas tasyātmajā nṛpa
sumatir dhruvo 'pratirathaḥ
ṛteyoḥ — from the son named Ṛteyu; rantināvaḥ — the son named Rantināva; abhūt — appeared; trayaḥ — three; tasya — his (Rantināva's); ātmajāḥ — sons; nṛpa — O King; sumatiḥ — Sumati; dhruvaḥ — Dhruva; apratirathaḥ — Apratiratha; kaṇvaḥ — Kaṇva; apratiratha-ātmajaḥ — the son of Apratiratha.
Ṛteyu had a son named Rantināva, who had three sons, named Sumati, Dhruva and Apratiratha. Apratiratha had only one son, whose name was Kaṇva.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness