In the Mangaian legend of origin, Rongo's sons by his wife Tavake (his daughter by his wife Te-po-tatango), Rangi, Mokoiro, and Akatauira, lifted the island of Mangaia up out of the underworld, becoming the first settlers and the ancestors of the Nga Ariki tribe, with Rangi becoming the first chief. The traditional name of the island was "A'u A'u", which literally means 'terraced', short for "A'u A'u Nui o Rongo ki te Ao Marama" ('Great Terraced Land of Rongo in the Land of Daylight').