Suhungmung (reign 1497–1539) (Swarganarayan, Dihingia Raja) (Assamese: স্বৰ্গদেউ চুহুংমুং) was one of the most important Ahom kings, who ruled at the cusp of Assam's medieval history. His reign broke from the early Ahom rule and established a multi-ethnic polity in his kingdom. Under him the Ahom Kingdom expanded greatly for the first time since Sukaphaa, at the cost of the Sutiya and the Kachari kingdoms. He also successfully defended his kingdom against the first Muslim invasions under Turbak Khan. During his time, the Khen dynasty collapsed and the Koch dynasty ascended in the Kamata kingdom. His general, Tonkham, pursued the Muslims up to the Karatoya river, the western boundary of the erstwhile Kamarupa Kingdom, the farthest west an Ahom king had ventured in its entire six hundred years of rule.
He was the first Ahom king to adopt a Hindu title, Swarganarayana, indicating a move towards an inclusive polity; and Ahom kings came to be known as the Swargadeo (heaven-lord). He is also called the Dihingia Raja, because he made Bakata on the Dihing River his capital. Suhungmung was the last progenitor Ahom king (all subsequent kings were his descendants).
Under Suhungmung the Ahom Kingdom acquired a vision of an extended polity and consolidated rule. He began by suppressing the revolt of the Aitonia Nagas in 1504 and making them accept Ahom overlordship. He surveyed the country and annexed the Habung region. But his biggest successes were against the Sutiya Kingdom.
The conflict began in 1513 under the Sutiya king Dhirnarayan when Suhungmung annexed Mungkhrang and Namdang. The Sutiya counterattack came in 1520 when the newly established fort at Mungkhrang was taken. But the Ahoms fought back, retook the fort and extended the Ahom Kingdom to the mouth of the Tiphao River, where a new fort was constructed. This fort was soon attacked by the Sutiyas and it came under their control. In 1522 when Dhirnarayan gave away the throne to Nityapal, Suhungmung attacked a much weaker Sutiya kingdom. The Sutiyas fortified Sadia but they were soon defeated. The Sutiyas were pursued further and their king and prince were killed in battle. Suhungmung established the office of the Sadiakhowa Gohain to look after the newly acquired region. Though this was not the end of the conflict it brought to an end the first major expansion of the Ahom Kingdom.