Sukhrungphaa (reign 1696–1714), or Swargadeo Rudra Singha (Assamese: স্বৰ্গদেউ ৰূদ্ৰ সিংহ), was a Tungkhungia king of the Ahom kingdom under whom the kingdom reached its zenith of power and glory. Rudra Singha, known as Lai before he became the king, was the son of the previous Ahom king Gadadhar Singha. An illiterate (probably dyslexic), he is best known for building a coalition of rulers in the region and raising a vast composite army against the Mughal Empire. He died on the eve of his march west from Guwahati.
His father had to escape persecution by the previous Ahom king and his mother, Joymoti Konwari, was killed in royal custody. He established his capital at Rangpur.
Though he was an illiterate himself, he had an expansive and progressive political vision, just as Akbar had. Rudra Singha subjugated the Dimasa (1706) and the Jaintia kingdoms. His father had removed the last vestiges of the Mughal rule in Assam, and he planned to extend his kingdom up to the Karatoya river, the traditional western boundary of the erstwhile Kamarupa kingdom. He began forming an alliance with different kingdoms and positioned himself at Guwahati for the expedition with a large army and fleet, along with the troops from the Dimasa-Kacharis (14,000), the Jaintiyas (10,000) and the Daflas (600), when he died. The later kings did not follow up on his plans.
Rudra Singha reversed the persecution of the Vaishnava xatras during Gadadhar Singha's reign and reinstated the xatra preceptors, including Chaturbhujdeva the satradhikari of Mayamara xatra, in their former seats. But he forbade the sudra satradhikars from initiating Brahmins and Brahmins from vising sudra monasteries, under the influence of the gosain of Auniati xatra who was the royal perceptor.