The Tongatapu group of islands in the south western Pacific Ocean were discovered by Tasman in 1643. The Kingdom of Tonga attained unity under Taufa’ahau Tupou (George I) who became ruler of his native Ha’apai in 1820, of Vava’u in 1833 and of Tongatapu in 1845. By 1860 the kingdom had become converted to Christianity. In 1862 the king granted freedom to the people from arbitrary rule of minor chiefs and gave them the right to the allocation of land for their own needs. These institutional changes, together with the establishment of a parliament of chiefs, paved the way towards a democratic constitution. By the Anglo-German Agreement of 14 Nov. 1899, the Tonga Islands became a British protectorate. The protectorate was dissolved on 4 June 1970 when Tonga, the only ancient kingdom surviving from the pre-European period in Polynesia, achieved independence within the Commonwealth.
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