(1)

Itihasa mentions that there were two great dynasties— Surya Vamsha and Chandra Vamsha.

The first proper king of the Surya Vamsha was Ikshvaku and the Ramayana is a chronicle of the solar dynasty, or at least a part of its history.
(2)

Similarly, the first king of the Chandra Vamsha was ILA and the Mahabharata is a chronicle of the lunar dynasty. The Puranas also describe the histories of the solar and lunar dynasties.
(3)

Though there are some inconsistencies across genealogies given in different Puranas, the surya vamsha timeline has three broad segments: (a) from Ikshvaku to Rama; (b) from Kusha to Brihadbala; and (c) from Brihadbala to Sumitra.
Credits: Above text taken as such from Introduction in Valmiki Ramayana, translated by Bibek Debroy.
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