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The Tuʻi Tonga Empire. The Tuʻi Tonga Empire was a powerful maritime empire centered on the island of Tongatapu that dominated large swathes of Polynesia from roughly 950 CE to 1500 CE. Ruled by a lineage of sacred paramount chiefs known as the Tuʻi Tonga, the empire projected naval power across hundreds of miles of ocean, bringing Fiji, Samoa, Niue, and parts of the Cook Islands into its political and tributary sphere.
The empire built massive stone monuments and royal tombs, most notably the Haʻamonga ʻa Māui trilithon, demonstrating advanced engineering and centralized political mobilization. Wealth was extracted through regular tributary voyages (Inasi), where subject islands sent fine mats, food, and feathers to the Tongan capital. Internal dynastic feuds and rising regional resistance from Samoa in the 15th century eventually weakened central authority, transforming the empire into a more localized spiritual monarchy.