Brhaspatimitra has been called Magadharaja, a king of Magadha, in kharavelas hathigumpa inscription (that is related to hathigumpa inscriptio. If the Brhaspatimitra mentioned in the inscription is the same king as the Brhaspatimitra of Mitra dynasty, then that would mean that the dynasty held a considerable influence in the region surrounding Kosambi. It is worth to note that there is numismatic evidence to support this theory, as Magadha is not known to not have produced any typical regional coinage unlike the contemporary Kosambi, Mathura or Panchala
