Tama-i-wāhia signed Te Tiriti at Tauranga in April or May 1840. He was a tohunga whose pā at Ōtamarākau near Maketū was attacked by Te Arawa in 1832. He was forced to flee with his people to Tauranga. Encouraged by a vision that he had, his people launched an attack on Ōtamarākau in order to re-take it. However, their attack failed and Tama-i-wāhia was nearly killed in consequence for failing to correctly predict the outcome of the battle.
For further information and sources see Debbie McCauley, The Treaty of Waitangi in Tauranga: Te Tiriti o Waitangi ki Tauranga Moana: https://debbiemccauleyauthor.wordpress.com/heritage/cultural-heritage/te-tiriti-o-waitangi-ki-tauranga-moana-treaty-signatories