He would not be drawn on the location of the hill, but on the western side of the town is the 86m volcanic cone called Kaikohe Hill where a monument to Mr Rankin's ancestor Hone Heke Ngapua was unveiled by Acting Prime Minister Sir James Carroll in 1911.
The warrior chief Hone Heke Pokai (1810-50) had no children. Hone Heke Ngapua (1869-1909) was the chief's grand nephew. He became the Northern Maori MP in 1893, a year later famously introducing the Native Rights Bill which sought a constitution for Maori, implementation of the Treaty of Waitangi, and a separate Maori Parliament. Although supported by many tribes, the bill was not passed.
Mr Rankin said the warrior chief's mere had been passed down to him by his late father, Graham, via Hone Heke Ngapua.
While Mr Rankin has in the past permitted some of the chief's personal effects in his possession to be exhibited publicly, the mere has always been kept under wraps.
''If anyone questions my right to speak for Heke's whanau I tell them the mere is my mandate.''