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.
