Son of Queen Salote and the current ruler of Tonga.
He was known formerly for being the world's heaviest monarch, even earning a place in the Guinness Book of World Records when he weighed 201kg (444lb). Since then, he has lost around 80kg and exercises regularly.
His reign has been a time of modernization and struggle between the influx of Western ideas and the retention of traditional values and culture.
He is also responsible for the admission of Tonga to the Commonwealth of Nations.