What is "burhagohain"

Buragohain ( Ahom language:Chao Phrang Mong) was the first of the two original counsellors in the Ahom kingdom. He was selected by the Ahom king from members of the Ahom nobility (Satgharia Ahom), who was not eligible for the position of Ahom kingship. The other original counsellor is the Borgohain. Both the positions existed from the time of the first Ahom king, Sukaphaa. The Burhagohain administered the region north of the Dikhow river up to Sadia.