The Moriori genocide
The Moriori are the indigenous people of the Chatham islands. They were Maori Polynesians that settled in the islands from New Zealand in the 16th century. The Moriori consisted of a small population, with its highest number of inhabitants being 2000 at their peak. They lived by the law of Nunuku, a code of non-violence and passive resistance, banning warfare and cannibalism.
https://infogr.am/themoriori-genocide