Te Mātia signed Te Tiriti at Ōtaki on 19 May 1840. He was regarded as being second in rank only to Te Whatanui within Ngāti Pare. He married Paranihia Te Whāwhā, a daughter of Te Ruru, and they had three daughters.
He was baptised Te Mātenga (Marsden). He lived at Ōtaki. The bishop Octavius Hadfield found him a cantankerous objector to the introduction of Christianity, but their feud ended when Te Mātia converted to the new religion.