The first known ruler of Assam was

Mahiranga (Mirong) Danava was the earliest King of Assam. According to ancient literature and mythology, present day Assam was a part of Pragjyotisha kingdom ruled by Danava dynasty. It was in Iron age. The first ruler of Danava dynasty was Mahiranga Danava. There is no archeological evidence to support the existence of Danava dynasty. But Danava dynasty and their rulers were mentioned in the Kalika Puran.