Asmaka was a kingdom among the 16 Mahajanapadas mentioned in the Buddhist texts. All other kingdoms were in the north, from Vanga to Gandhara. Some believes that Asmaka was a colony of the Kambojas, and its earlier name was Aswaka. The epic Mahabharata mentions that the king of the name Asmaka was the adopted son of Saudasa alias Kalmashapada a king of Kosala and an Ikshwaku ruler.
References
Asmaka Kingdom Wikipedia(Text) CC BY-SA