Rāwiri Mutu signed the Treaty of Waitangi on 12 February 1840 at Mangungu, Hokianga.
In 1853 he was among a number of Hokianga chiefs who showed their support for continuing peace by recalling an 1831 letter to King William IV asking for protection from the French, and the Treaty of Waitangi.
In 1867 he was one of a group of Hokianga chiefs who peacefully resolved a tribal dispute at Waimā.