According to numerous Puranas, the military corporations of the Shakas, Yavanas, Kambojas, Pahlavas and Paradas, known as "five hordes" (pānca-ganah), had militarily supported the Haihaya and Talajunga Kshatriyas in depriving Ikshvaku king Bahu (the 7th king in descent from Harishchandra), of his Ayodhya kingdom.
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Patanjali in his Mahabhasya regards the Shakas and Yavanas as pure Shudras (II.4.10).
Like the Shakas, Pahlavas, Kambojas, Paradas, a section of the Rishikas had also migrated to west/south-west India prior to Christian era.