Following the death of the previous monarch, his son-in-law, Udai took royal power himself, for a time supplanting the ruling dynasty with his own line.
[2] He began his career during the reign of Vijaya Manikya II, serving as a gomasta (rent-collector) in Dharmanagar,[3] though was later driven out of this position after having climbed a tree belonging to a Brahmin.
[5] Upon the ascension of his son-in-law, Ananta Manikya, to the throne in 1563, Gopi Prasad expanded his already extensive power,[6] keeping the new king completely under his control.
[7][8] Regardless, the latter subsequently claimed royal power and adopted the regnal name Udai Manikya, assuming the erstwhile ruling dynasty's cognomen.
He was less successful in warfare however, having become involved in a 5-year-long conflict with Sulaiman Khan Karrani, the Sultan of Bengal, resulting in the heavy loss of money, 40,000 troops and the area of Chittagong.