|Canto 9: Liberation||Chapter 23: The Dynasties of the Sons of Yayāti|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 9.23.33
teṣāḿ tu ṣaṭ pradhānānāḿ
dharmo nāmośanā tasya
teṣām — out of so many sons; tu — but; ṣaṭ pradhānānām — of whom there were six foremost sons; pṛthuśravasaḥ — of Pṛthuśravā; ātmajaḥ — the son; dharmaḥ — Dharma; nāma — by the name; uśanā — Uśanā; tasya — his; hayamedha-śatasya — of one hundred aśvamedha sacrifices; yāṭ — he was the performer.
Among these many sons, six were the foremost, such as Pṛthuśravā and Pṛthukīrti. The son of Pṛthuśravā was known as Dharma, and his son was known as Uśanā. Uśanā was the performer of one hundred horse sacrifices.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness