In 1840 Iwikau Te Heuheu and others were in Auckland trading flax and later attended the meeting at Waitangi. However he did not authority to sign as that right was held by his older brother Mananui as ariki. Later during the Flagstaff War Mananui attempted to support Hōne Heke, but was dissuaded to do so by Waikato. Iwikau Te Heu Heu replaced his brother in 1846 and was a key supporter of the founding of the Kingitanga movement after hearing of growing abuses and land theft by the British Colonials.