Sudoiphaa's reign witnessed the end of the ministerial dictatorship of Atan Burhagohain and rise of Laluksola Borphukan, the Ahom Viceroy of Guwahati and Lower Assam, as the real authority behind the throne.
In order to gain absolute authority in the Royal Court, Laluksola Borphukan, treacherously surrendered the garrison of Guwahati to Mughals, and held Atan Burhagohain and other nobles as captive.
Also the Tai-Ahom priestly clans, the Deodhais, and the Bailongs, who considered themselves as the guardian of the throne, strongly opposed the elevation of any person of non-royal blood as the king.
[5] Soon after the accession of Sudoiphaa the commanders of Guwahati, who had helped Atan Burhagohain in the deposition of previous monarch, Sujinphaa left the capital for resuming, charge at their respective posts.
[6] Meanwhile Dighala Gohain, the surviving son of Sujinphaa was finally caught at a monastery in Sologuri, by a royal officer named Tepartalia Ram Phukan.
The king gave valuable presents to the Burhagohain consisting of sedans, carpets, swords, golden trays and ornaments, elephants and horses, lands in Charaideo hill, and an estate in Dulung with eighty servitors.
The monarch issued an order to the effect that the estates settled on Atan Burhagohain should be enjoyed in perpetuity by him and his descendants as long as members of Sudoiphaa's family remained in occupation of the Ahom throne.
[8][9] The assumption of office by the new monarch was followed by a partial overhauling of the official personnel which was carried out on the advice of Atan Burhagohain who naturally wanted to promote his adherents to power.
According to the custom of the Ahoms it was necessary for the Burhagohain, the Borgohain, and the Borpatrogohain to pay their homage to the new king and his chief consort by prostration repeated seven times.
The king took the Burhagohain to task, saying,-"The Dangarias paid their homage to me in the usual form; but why did they retire to their residences without kneeling down before the Barkonwari or Chief Queen?
[12]" Sudoiphaa rebuked the Chief Queen as well for the un-queenly demeanour shown by her in her unwillingness to receive the obeisance of her father; she was described by her royal consort as the daughter of "a king-making and king unmaking rebel".
The queen's filial conscience was eased by the thought that her father's obeisance had been paid to the sacred manuscript, and not herself; while the exacting monarch construed the salutation as being meant for his consort which thus removed his grievance against the Burhagohain.
Chikan Tamuli then inflicted four blows on the body of the king with his axe-shaped dao, one on the head, another on the left arm, a third on the back, and a fourth on the palm of the right hand.
[21][22] Having heard of the attack Prime-Minister Atan Burhagohain and the Phukans tightened the watch in the palace, and engaged expert physicians to attend to the wounds which were rapidly healed, and Sudoiphaa soon returned to his normal health and disposition.
The king, however, held that the attack could not have been made by men from Dihing without the connivance and support of confederates living at the capital, as the entrances to the palace were vigilantly guarded at night.
[30] In the middle of 1676 CE, Raja Ram Singh I of Amber, had returned to Delhi being unsuccessful in his attempt to reoccupy Guwahati for Mughals, after his defeat in the Battle of Saraighat.
In his message to Laluksola Borphukan, he warned of dire consequence, in case of refusal by the Ahoms, giving reference to the number of horses and elephants in his army, an example of his military strength.
[37]' Atan Burhagohain immediately held counsel with Swargadeo Sudoiphaa and said-‘The elder son of Duara Phukan has fled to Saraighat out of the fear in connection with the murderous assault on the King.
[46][47] According to some historical records, Ramani Gabharu alias Rahmat Banu Begum, the consort of prince Muhammad Azam Shah, also the niece of Laluksola Borphukan, tried to stop her uncle from surrendering the fortification of Guwahati to the Mughals.
Swargadeo Sudoiphaa immediately ordered the three Dangarias, the Burhagohain, the Borgohain and the Borpatrogohain to suspend work at Chintamani rampart and to march Guwahati instead at the head of an adequate force.
The contingent sailed down the river, and halted at Biswanath, in present day Sonitpur District for sometime in order to form an accurate estimate of the situation.
He sent a message to Atan Burhagohain advising him to stay at Biswanath and send up his subordinate Phukans to Kaliabar to join his forces in an attack upon the Mughals at Guwahati.
Laluksola Borphukan then fixed his headquarters at Kaliabar, where he began to act in an independent manner totally ignoring the authority of king Sudoiphaa, appointing and dismissing officers at will.
Having received this message from the Dulia Barua at Chinatali, the Guwahati nobles, led by Laluksola Borphukan sent a reassuring reply to Sudoiphaa denying sinister intentions against him.
In appreciation of the promises of loyalty and support made by Laluksola Borphukan and his colleagues, Swargadeo Sudoiphaa gave them rich presents, consisting of ornaments and cloths, whereupon they returned to Kaliabar to resume charge of their respective commands.
Sudoiphaa in his fury kicked the tray, and began to curse the Lukhurakhuns (the Ahom clan from which Laluksola Borphukan and his brothers hailed), describing them as a cabal engaged in the game of making and unmaking kings.
On the eve of his approaching end, Sudoiphaa thrust into his mouth a morsel of rice and quickly spat it back, saying, "Let there be famine in the land as a punishment for this injustice and cruelty."
Sudoiphaa's reign witnessed the intense power struggle between Prime-minister Atan Burhagohain and Laluksola Borphukan, in which the latter emerged victorious, but at the price of surrendering Lower Assam and Guwahati to the Mughals.
One can observe how defiantly he proposed his resignation from his kingship, when he thought that the prime-minister Atan Burhagohain and other nobles broke the age-old customs by not bowing to his Chief Queen or Barkuanri.
His efforts to establish the royal authority over administration and to arrest the ambitious Laluksola Borphukan for his crime against the country, finally led to his own deposition and nemesis.