Tuʻi-tā-tui (translation: The king who strikes the knee) was the 11th king of the Tuʻi Tonga, a dynasty in Tonga, who supposedly lived during the 12th century AD. Most of what is known about him is through Tongan myths and tales.
According to legend, Tuʻitātui had, like his father Momo, his court in Heketā (meaning: cripple hit), near the village of Niutōua on Tongatapu. It was there that he built, as an impressive gateway to the royal compound, the Haʻamonga-ʻa-Maui. From the Haʻamonga a path proceeded about 50 m to the slightly elevated ʻesi maka fākinanga, (stone to lean against) where the king sat against with his back, safe from any assassin from that direction. He was a huge, strong man, and easily handled a large stick as whether it was nothing. He hit everybody against the knees who would approach him too closely from the front. At par with this was his introduction of a new kava circle layout (a formal gathering of the chiefs of the country under him), in which the king sat more apart from the others (including supposed assassins) than before.
He also built there at Heketā the earliest known langi (burial tombs)– Langi Heketā and Langi Moʻungalafa (where four of his children were buried), but he himself would not use them. These stone structures still exist. He also made a sporting field to play sikaʻulutoa (reed throwing stick).
In addition to the Tuʻi Tonga maritime empire, Tuʻitātui also inherited from his father-in-law Loʻau as a kind of prime minister. Together they put through landownership and social reforms, re-shuffled and strengthened the royal council of the Fale Fā (house of four), the ancient royal counselors and royal guardians of the Tuʻi Tonga. Tuʻitātui removed from the Fale Fā, Matakehe and Tuʻifolaha and replaced them with Tuʻitalau and Tuʻiʻamanave from Talau of the northern island of Vava'u.