Haʻamonga ʻa Maui (Burden of Maui) - is a stone trilithon located in Tonga, in the north of the island of Tongatapu, near the village of Niutōua, in Heketā.
Trilithon is constructed from three coral limestone slabs, and is up to 5.2 m high, 1.4 m wide, 5.8 m long. The weight of the visible part of each upright stone is approximately 30 - 40 tons. There are hewn deep mortises in the top of each upright stone to fit in the lintel.
Ha'amonga 'a Maui was built at the beginning of the 13th century under the 11th Tuʻi Tonga Tuʻitātui (king strike the knee), most likely as a gateway to his royal compound Heketā. One can pass through the portal and walk the short distance towards the ʻesi maka faakinanga (stone to lean against), which served as the king's throne.
Sitting with his back to that stone he was safe from assassins from behind and with his long stick he could hit every potential foe from the front on his knees.