Ngāti Porou in the context of "Marae"

Ngāi Tahu, or Kāi Tahu, is the principal Māori iwi (tribe) of the South Island. Its takiwā (tribal area) is the largest in New Zealand, and extends from the White Bluffs / Te Parinui o Whiti (southeast of Blenheim), Mount Māhanga and Kahurangi Point in the north to Stewart Island / Rakiura in the south. The takiwā comprises 18 rūnanga (governance areas) corresponding to traditional settlements. According to the 2023 census an estimated 84,000 people affiliated with the Kāi Tahu iwi.

Ngāi Tahu originated in the Gisborne District of the North Island, along with Ngāti Porou and Ngāti Kahungunu, who all intermarried amongst the local Ngāti Ira. Over time, all but Ngāti Porou would migrate away from the district. Several iwi were already occupying the South Island prior to Ngāi Tahu's arrival, with Kāti Māmoe only having arrived about a century earlier from the Hastings District, and already having conquered Waitaha, who themselves were a collection of ancient groups. Other iwi that Ngāi Tahu encountered while migrating through the South Island were Ngāi Tara, Rangitāne, Ngāti Tūmatakōkiri, and Ngāti Wairangi – all of which also migrated from the North Island at varying times. During the 19th century, hundreds of thousands of Europeans – mostly British – migrated to New Zealand. After European arrival, Ngāti Toa (allied with Ngāti Tama) and Ngāti Rārua invaded Ngāi Tahu's territory with muskets. Some European settlers intermingled with native iwi populations, and today, most families who descend from Ngāi Tahu also have Ngāti Māmoe and British ancestry.

The Māori King movement, called the Kīngitanga in Māori, is a Māori movement that arose among some of the Māori iwi (tribes) of New Zealand in the central North Island in the 1850s, to establish a role similar in status to that of the monarchy of the United Kingdom as a way of halting the alienation of Māori land. The first Māori king, Pōtatau Te Wherowhero, was crowned in 1858. The monarchy is non-hereditary in principle, although every monarch since Pōtatau Te Wherowhero has been a child of the previous monarch. The eighth monarch is Nga wai hono i te po, who was elected and crowned in September 2024.

The Māori monarch operates in a non-constitutional capacity outside the New Zealand government, without explicit legal or judicial power. Reigning monarchs retain the position of paramount chief of several iwi, and wield some power over these, especially within Tainui. The influence of the Māori monarch is widespread in Māoridom despite the movement not being adhered to by several major iwi, notably Tūhoe, Ngāti Porou, and the largest of all, Ngāpuhi. The headquarters for the King movement is Tūrangawaewae Marae in the town of Ngāruawāhia.