Manalargenna was the chief of the Ben Lomond tribe (Plangermaireener Nation). He was one of the first Aboriginal leaders to establish peaceful relations with white people. He surrendered to Augustus Robinson in 1830 and died at Wybalenna in 1835.

Many of Manalargenna's descendents ended up on Cape Barren Island, which today form a lively component of the Palawa community in Tasmania. Since the notorious black line that pushed the indigenous population of Tasmania off the island, it has been popularly held that there were no Tasmanian Aborigines left. Truganini was understood as the 'last of the Tasmanians'. Contemporary Tasmanians are now recognising the Aboriginal status of the Cape Barren Islanders. Many of them share common descent from Mannarlargenna.

When we were off Swan Island MANNALARGENNA the chief gave evident signs of strong emotion. here opposite to this island was his country; Swan Island was the place I brough him to when I removed him from his country. He paced the deck, looked on all the surrounding objects, fresh recollections came to his mind. He paced to and fro like a man of consequence, like an emperor. Round his head he had tied a slip of kangaroo skin, which added greatly to his imperial dignity. At one time he took the map in his hand and looked on it intently, took the spyglass and looked through it. It was amusing enough to see him. He allowed that I was equally great with himself, that I had travelled in all directions. Swan Island is called WALE.KOME.KUN.NER.

Augustus Robinson, in N.J.B. Plomley Weep In Silence: History of the Flinders Island Aboriginal settlement Sandy Bay: Blubber Head Press, 1987, pp. 297-98