Rupanarayana seceded by his elder son Upendranarayana. His coins are relatively common. It seems that production of his coins had increased during the latter part of his tenure. This occurred most probably after 1754. When transit trade between India and Tibet through Nepal virtually ceased, because of the siege of the Nepal Valley by Prithvi Narayan Shah. Both Cooch Behar and Bhutan benefitted because they provided a viable alternative route for trade between India and Tibet. But during the same period ,Bhutan started encroaching towards the plains, which were under the jurisdiction of Coochbehar. Upendranarayana fought several times to resist the explanation, but could not do very little.