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Theorder of succession to the throne ofTonga is laid down in the 1875 constitution. The crown descends according tomale-preference cognatic primogeniture. Only legitimate descendants through the legitimate line of KingGeorge Tupou I's son and grandson, Crown PrinceTēvita ʻUnga and PrinceʻUelingatoni Ngū, are entitled to succeed. A person loses their right of succession and deprives their descendants of their right of succession if they marry without the monarch's permission.
The current line of succession is as follows:[1]
King Tāufaʻāhau Tupou IV (1918–2006)King George Tupou V (1948–2012)
King Tupou VI (born 1959)