 In 1870 Ngati Mutunga, one of the invading tribes, argued before the Native Land Court in New Zealand that their gross mistreatment of the Moriori was standard Maori practice or tikanga.The isolated island of Rapa Nui/Easter Island was inhabited by the Rapanui, who suffered a series of slave raids from 1805 or earlier, culminating in a near genocidal experience in the 1860s.The 1805 raid was by American sealers and was one of a series that changed the attitude of the islanders to outside visitors, with reports in the 1820s and 1830s that all visitors received a hostile reception.