Ngāti Mutunga in the context of "Musket Wars"

Ngāti Tama is a Māori tribe of New Zealand. Their origins, according to oral tradition, date back to Tama Ariki, the chief navigator on the Tokomaru waka. Their historic region is in north Taranaki, around Poutama, with the Mōhakatino River marking their northern boundary with the Tainui and Ngāti Maniapoto. The close geographical proximity of Tainui's Ngāti Toa of Kawhia and the Ngāti Mutunga explains the long, continuous, and close relationship among these three tribes.

Ngāti Toa, also called Ngāti Toarangatira or Ngāti Toa Rangatira, is a Māori iwi (tribe) based in the southern North Island and the northern South Island of New Zealand. Ngāti Toa remains a small iwi with a population of about 9,000. The iwi is centred around Porirua, Plimmerton, Kāpiti, Blenheim and Arapaoa Island. It has four marae: Takapūwāhia and Hongoeka in Porirua City, and Whakatū and Wairau in the South Island. Ngāti Toa's governing body has the name Te Rūnanga o Toa Rangatira.

The iwi traces its descent from the eponymous ancestor Toarangatira. Ngāti Toa lived in the Kāwhia region of the North Island until the 1820s, when forced out by conflict with other Tainui iwi, led by Pōtatau Te Wherowhero (c. 1785 – 1860), who later became the first Māori King (r. 1858–1860). Ngāti Toa, Ngāti Rārua and Ngāti Koata, led by Te Rauparaha (c. 1765 – 1849), escaped south and invaded Taranaki and the Wellington regions together with three north Taranaki iwi, Te Āti Awa, Ngāti Tama and Ngāti Mutunga. Together they fought and conquered the people of Wellington, Ngāti Ira, who practically ceased to exist as an independent iwi.After the 1820s, the region conquered by Ngāti Toa extended from Miria-te-kakara at Rangitikei to Wellington, and across Cook Strait to Wairau and Nelson.

The Chatham Islands (/ˈtʃætəm/ CHAT-əm; Moriori: Rēkohu, lit. 'Misty Sun'; Māori: Wharekauri) are an archipelago in the Pacific Ocean about 800 km (430 nmi) east of New Zealand's South Island, administered as part of New Zealand, and consisting of about 10 islands within an approximate 60 km (30 nmi) radius, the largest of which are Chatham Island and Pitt Island (Rangiauria). They include New Zealand's easternmost point, the Forty-Fours. Some of the islands, formerly cleared for farming, are now preserved as nature reserves to conserve some of the unique flora and fauna.

The islands were uninhabited when the Moriori people arrived around the year 1500 and developed a peaceful way of life. In 1835, members of the Ngāti Mutunga and Ngāti Tama Māori iwi from the North Island of New Zealand invaded the islands and nearly exterminated the Moriori, enslaving the survivors.

The Moriori are the first settlers of the Chatham Islands (Rēkohu in Moriori; Wharekauri in Māori). Moriori are Polynesians who came from the New Zealand mainland around 1500 AD, which was close to the time of the shift from the archaic to the classic period of Polynesian Māori culture on the mainland. Oral tradition records migration to the Chathams in the 16th century. The settlers' culture diverged from mainland Māori, and they developed a distinct Moriori language, mythology, artistic expression and way of life. Currently there are around 700 people who identify as Moriori, most of whom no longer live on the Chatham Islands. During the late 19th century some prominent anthropologists proposed that Moriori were pre-Māori settlers of mainland New Zealand, and possibly Melanesian in origin; this hypothesis has been discredited by archaeologists since the early 20th century, but continued to be referred to by critics of the Treaty of Waitangi settlement process into the 21st century.

Early Moriori formed tribal groups based on eastern Polynesian social customs and organisation. Later, a prominent pacifist culture emerged; this was known as the law of nunuku, based on the teachings of the 16th century Moriori leader Nunuku-whenua. This culture made it easier for Taranaki Māori invaders to massacre them in the 1830s during the Musket Wars. This was the Moriori genocide, in which the Moriori were either murdered or enslaved by members of the Ngāti Mutunga and Ngāti Tama iwi, killing or displacing nearly 95% of the Moriori population.

The Moriori genocide was the mass murder, enslavement, and cannibalism of the Moriori people, the indigenous ethnic group of the Chatham Islands, by members of the mainland Māori New Zealand iwi Ngāti Mutunga and Ngāti Tama from 1835 to 1863. The invaders murdered around 300 Moriori and enslaved the remaining population. This, together with diseases brought by Europeans, caused the population to drop from 1,700 in 1835 to 100 in 1870. The last full-blood Moriori, Tommy Solomon, died in 1933.

In Māori tradition, Tokomaru was one of the great ocean-going canoes that were used in the migrations that settled New Zealand. It was commanded by Manaia. His brother-in-law had originally owned the canoe. When Manaia's wife was raped by a group of men, he slew them, including the chief Tupenu. Killing his brother-in-law, he took the Tokomaru and set sail with his family for New Zealand. Landing at Whangaparaoa, they finally settled at Taranaki. Te Āti Awa, Ngāti Mutunga, Ngāti Tama iwi trace their ancestry back to Tokomaru.