Priyo Ratana Mahāthera was a Buddhist guru entitled the Rajguru in Chakma Raj Bihar and the first known Tanchangya monk who went abroad for Buddhist studies in Sri Lanka in 19th century.

He was born named Palak Dhan in 1879 to a poor family in Tanchangya tribe.

The numbers of monks were fewer than the Luri in the northern part of Chittagong Hill Tracts.

They had become monks to avoid the torture experienced by non-Buddhist rulers, later adopting it as their practice.

Due to the strong practise of Hinduism, Venerable Bhante could not propagate Buddhism there.