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Wiki information Tupouto:
Siaosi Manumataongo ʻAlaivahamamaʻo ʻAhoʻeitu Konstantin Tukuʻaho is a Tongan royal and Crown Prince of Tonga. Tupoutoʻa ʻUlukalala became heir-apparent to the throne in March 2012 when his father, Tupou VI ascended as the current King of Tonga.
Tupouto'a was the ruler of Ha'apai, Tonga from 1808 to 1820 and the father of the first king of Tonga, Tāufā'ahāu.