The status of Maori as the country's indigenous population could be in danger if research, which suggests previous civilisations lived in New Zealand before Maori arrived, is proved true.
Ngapuhi leader David Rankin said books by authors such as investigative journalist Ian Wishart and historian Noel Hilliam presented "clear evidence" that some of New Zealand's earliest residents might have arrived before the Polynesians.
He pointed to numerous Maori oral histories which referred to people being here when the first Maori arrived, including fair-skinned people.
"If we believe our histories, then we as Maori are not the indigenous people of New Zealand."
The archaeological evidence in some research was a potential challenge to the status of Maori as indigenous, which was why he believed no other Maori was prepared to speak publicly on the issue, Mr Rankin said.