Eruini (or Herewini) Te Tupe-o-Tū signed Te Tiriti at Queen Charlotte Sound on 4 May 1840. He was married to Te Uira Mātenga, the daughter of Te Mātenga Te Mātia of Ngāti Raukawa, who also signed this Treaty sheet. Their marriage formed a political alliance between their powerful families.
Eruini was a whaler, ship owner and farmer. He spent his later years at Waikanae.