Mato signed the Bay of Plenty (Fedarb) sheet of the Treaty of Waitangi at Whakatāne on 16 June 1840. He was a Ngāti Awa rangatira (chief).
In 1824, Mato led Ngāti Awa of Whakatāne in a taua (war party) from Ruatāhuna to Wairoa to avenge the deaths of Te Toroa and Rangi-wai-tatao. Ngāti Kahungunu were defeated in a battle fought on the banks of the Wai-reporepo stream.