Mannalargenna is an ancestral grandfather of Tasmania Aboriginal people; an elder of the Plangermaireener clan at Cape Portland, who resisted invasion.

In 1829 he freed four Aboriginal women and a boy from noted figure John Batman's house, where they had been kept since they were captured a year before, according to the University of Tasmania.

"In 1830, Mannalargenna voluntarily joined GA Robinson's 'friendly mission', but, although he was supposed to be helping Robinson persuade Aboriginal people to surrender, in fact he led Robinson in circles away from them," historian Alison Alexander writes.

"Mannalargenna said that he consulted a Spirit about the location of Aboriginal groups, which continually misled him, to Robinson's fury."

Although Robinson had promised that if Mannalargenna helped him he would not be sent to the Flinders Island establishment, the promise was broken, and Mannalargenna died in captivity.

An Aboriginal cultural day held each year in the Far North-East is named in his honour, held by the Melythina Tiakana Warrana Aboriginal Corporation.

On Saturday, December 7, Mannalargenna Day will be held from from 10am at Tebrakunna Visitors Centre, Musselroe Wind Farm, Cape Portland.

A bus will depart the Inveresk car park bus stop in Launceston at 7.15am, arriving about 10.30am via Scottsdale.

It will depart the Mannarlargenna Day event at 4pm for arrival back at Inveresk about 7pm.

There will be an art exhibition on site, with a discussion with the artists at 11am chaired by City of Launceston cultural director, Tracy Puklowski.

The event will be opened by Governor Kate Warner, a longtime supporter of Mannalargenna Day, at 10.30am, accompanied by a welcome to country and ochre ceremony.

There will be a smoking ceremony followed by a dancing ceremony at 12pm.

There will be a snake display, discovery ranger display, cultural activities, and opportunities to learn about cultural practices in "a glorious part of coastal country", organisers said.

The event officially finishes at 5.30pm, but there will be supper of kangaroo tail soup and damper at that time followed by two twilight tours to see animals, at 6pm and 8pm.