[2] He also fought against the invading forces of Koch kingdom led by Chilarai during the reign of his elder brother Suklenmung and his nephew Sukhaamphaa.
In his eagerness to enhance the prestige of his guru, the king ordered all his nobles and the twelve Vaishnava Mahantas or Monks of Thakuria denomination to become disciples of Paramananda Sannyasi.
Debera Hazarika, an Ahom officer of Lukhurakhun clan organized a plot to overthrow the reigning monarch Udayaditya Singha and place his brother Sarugohain on the throne instead.
The prince gave vent to his resentment on the conduct of Udayaditya Singha, "The Bairagi has become to my brother, not a mere hermit, but an object of extreme veneration, the Saheb of his head.
[8] Debera Hazarika, the ring leader of the coup which ousted Udayaditya Singha, was dissatisfied with his position, as he felt that all others got the benefits of the new regime but him.
During a visit to the Ahom shrine at Charaideo, Debera informed the king that the Charing Raja, the younger brother of Ramdhwaj Singha, and Langichang Borgohain had taken possession of the Palace at Garhgaon.
Debera explained away the discrepancy by saying that a horse had been sent by the Borgohain to the Charing Raja, but the prince did not come, for which reason the plan to storm the palace at Garhgaon had to be abandoned.
[13] At that time, most of the prominent nobles, which include Atan Burhagohain and Laluk Sola Borphukan were stationed at Guwahati in order to repel possible Mughal attack from Bengal.
Ramdhwaj Singha's growing illness compelled him to summon all the nobles present in the Capital to make arrangements for a peaceful succession in the event of his sudden demise.
But after coming out of the royal presence, Debera Borbarua decided to oppose the elevation of all the three intended successors of the king as they might prove to be hostile towards him in future.
Debera directed Saona Tamuli to ask Kharmaju Bez, a physician attending the sick monarch, to mix poison with the medicine to be administered to the patient.
With no alternative left, Kharmaju was forced to obey the wish of Debera Borbarua, and the next dose of medicine brought the mortal years of Swargadeo Ramdhwaj Singha to an end.
Ramdhwaj Singha's Chief Queen, the one who always advised the monarch against Debera Borbarua, daughter of Chapara khowa Gohain was buried alive with her deceased husband.
[18] The reign of Ramdhwaj Singha ushered the age of ministerial supremacy, during which the ministers hold the actual power behind the throne and kings became mere puppet in their hands.
The instability and power struggle between various factions of Ahom nobles further destabilize the country and people of both high and low suffered from lack of security and peace.
Even though Ramdhwaj tried to reassert his authority by planning to kill Debera Borbarua, his witty minister not only escapes the assassination bid but committed massacre of Ahom officials in Garhgaon twice and finally brought an end to his master's life.