The Tuʻi Haʻatakalaua is a dynasty of Tongan kings which originated in the 15th century and assumed political power from the Tuʻi Tonga line.
In the 18th century, it merged power with the Tuʻi Kanokupolu dynasty, and became existent only esoterically by the end of the 18th century.
4 out of the current 33 hereditary noble titles in Tonga trace their authority from the Tuʻi Haʻatakalaua.
These are: Tungī, Luani, Fotofili and Fakafānua.
These 5 are considered to be traditional langi although not named so, as the real langi are for the Tuʻi Tonga only.