This is a list of monarchs of Tonga since 1875, after the constitutional role of the monarch was put forth. Tonga is the only kingdom in Oceania that is not a Commonwealth realm. The first monarch was George Tupou I.
In July 2008, three days before his coronation, King George Tupou V announced that he would relinquish most of his power and be guided by his Prime Minister's recommendations on most matters.
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