Suklamphaa (1672–1674) or Ramdhwaj Singha was a king of the Ahom kingdom. His reign is known for the rise in power of Debera Borbarua and the beginning of a ten-year period of power struggles among high officials of the kingdom that saw quick changes in kings via court intrigues and internal armed conflicts.
Ramdhwaj Singha was the third son of Namrupia Raja, the grandson of Sureng Deo Raja, great grandson of Ahom king Suhungmung. His grandfather Sureng Deo Raja was the founder of the Charingia branch of Royal Ahom Dynasty. Sureng Deo Raja was a valliant warrior, who fought many battles in military expedition against Sutiya Kingdom and Kachari kingdom during the reign of his father Suhungmung. 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. The early name of Ramdhwaj Singha was Sarugohain. Both of his elder brothers, Chakradhwaj Singha and Udayaditya Singha ascended the throne and successively became kings of Ahom kingdom
Udayaditya Singha became a disciple of Paramananda Sannyasi, an ascetic who hailed of Gokulpur in Vrindaban. 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. The nobles complied but the twelve Vaishnava Mahantas refused and were imprisoned. The imprisonment angered many including members of the Ahom nobility. 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. Accordingly he gathered the support of the three Dangarias, the Burhagohain, the Borgohain and the Borpatrogohain, and broached the proposal to Sarugohain who readily accepted the offer. 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. The Dangarias have also accepted initiation from the Bairagi, and the twelve Mahantas have been summoned. Justice cannot tolerate this impious situation." Sarugohain and Debera collected around a thousand men and in November, 1672, they attacked the royal palace at mid-night. After overpowering the royal guards, Udayaditya Singha was seized while his supporters, including Paramananda Sannyasi, were tortured and later killed. Sarugohain entered in the Royal audience-chamber and declared himself the sovereign of Ahom Kingdom. On the following day Udayaditya Singha was placed on a sedan and led to Charaideo Hill. His mother beseeched Sarugohain to spare the life of Udayaditya, or kill her along with the deposed monarch. Sarugohain consoled his mother saying that he and his brother would exercise joint domination, he from his headquarters at Garhgaon and Udayaditya from his capital Charaideo. Udayaditya was instead put to death soon after his arrival at Charaideo. Before he breathed his last he had put a handful of rice in his mouth and said, "An innocent is being killed! O, Great God, may retribution descend on him who is committing this crime!" The three wives of Udayaditya were also put to death.