Srimad Bhagavatam Canto 09, Chapter 10, Text 01

SB 9.10.1

sri-suka uvaca
khatvangad dirghabahus ca
 raghus tasmat prthu-sravah
ajas tato maha-rajas
 tasmad dasaratho ’bhavat
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Sukadeva Gosvami said: The son of Maharaja Khatvanga was Dirghabahu, and his son was the celebrated Maharaja Raghu. From Maharaja Raghu came Aja, and from Aja was born the great personality Maharaja Dasaratha.
Srimad Bhagavatam Canto 09, Chapter 10, Text 02