Ṛta (Rita) was the son of king Vijaya, in the genealogical line of Nimi, son of Ikṣvāku (Ikshvaku). Ṛta(Rita) had a son called Sunaka or Sunaya.

Bhāgavatpurāṇa Vols. 1-12(9.13.25-26)
Vāyupurāṇa(89.22)
Viṣṇupurāṇa(4.5.14)