What is "tupoumoheofo"

Tupoumoheofo was 12th Tu'i Kanokupolu of Tonga, and the only female to ever hold that title. She was the principal wife to the Tu'i Tonga though she may have been of higher social rank than him because of her matrilineal descent. After a vacancy in the Tu'i Kanokupolu title, she used her status to designated herself successor, reigning on Tongatapu for slightly less than one year starting in perhaps 1792 before being forcibly deposed by her distant relative Tuku’aho. Tupoumoheofo retreated to retirement in the northern Tongan Island of Vava’u under the protection of the 'Ulukalala family.