Thank you 4 the explanation. Is the urvashi you are talking about the apsara?This dynasty was known as Chandravansh, so I was trying to trace it right from him. Here is what I came up w/ - anybody is welcome to correct it if there are other sources.
Chandra had a son Budh from Tara, and this same Budh is mentioned in the Uttarkand. Once one ruler named Ila turned into a woman for entering a forest that Mahadev/Parvati were enjoying: Mahadev had blessed/cursed (take your pick π) that any man who entered that forest would become a woman. π Raja Ila didn't know about it, and when he & his retinue entered, they became women. Budh met Raja Ila and helped him perform an Ashwamedha to help him & his party regain their masculinity. In the meantime, Raja Ila gave birth to a son for Budh, and that son's name was Pururava.
This Pururava was the guy who married Urvashi, and their eldest son was Ayu. This Ayu had a wife named Indumati, and their son was Nahusha. This is the Nahusha who later became devraj when Indra abdicated for killing Trishiras & Vritra, while on earth, Nahusha was succeeded by Yayati. (There is some confusion about whether this Nahusha is the same as the Nahusha who killed the asura Hunda & married Asokasundari, but given the timelines of events, it's more logical to conclude that the 2 were different.)
Yayati, as is better known, married Shukracharya's daughter Devyani, who was cursed by Kacha that no Brahmin would ever marry her, while he messed around w/ Sharmishtha, the daughter of the Asura ruler who had been sentenced to be Devyani's maid. They had 5 sons and 5 dynasties as a result. One of them Yadu went on to beget the Yadavas, which included Krishna, and another Puru went on to beget the Kurus & later the Pandavas.
So just like Suryavansh (Rama's dynasty) started w/ Surya's son Manu, then Ikshvaku and went on down, this one started w/ Budh and went on down.
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