The Gauhati High Court was promulgated by governor general of India on 1 March 1948 after the Government of India Act 1935 was passed. Establishing the High Court of Assam with effect from 5 April 1948, for the then Province of Assam. It was originally known as the High Court of Assam and Nagaland, but renamed as Gauhati High Court in 1971 by the North-Eastern Areas (Reorganisation) Act, 1971. It has largest jurisdiction in terms of states, with its area covering the states of Assam, Arunachal Pradesh, Nagaland, and Mizoram. From Wikipedia
