The principal purpose of Captain James Cook’s last voyage, which began in Plymouth on 12 July 1776, was to discover the elusive Northwest Passage. Attempts had been made before, in vain, from the Atlantic, but this time it would be from the west, from the Pacific.

On the way, Cook was to return an Anglicised Polynesian named Mai to Raiatea, ‘a ragged volcanic island’ about 130 miles north west of Tahiti.