ʻAhoʻeitu was born in Nukuʻalofa, Tonga on 12 July 1959, as the third son and youngest child of Crown Prince Tupoutoʻa Tungī (later King Tāufaʻāhau Tupou IV).

[6] His military service included commanding the Pacific-class patrol boat VOEA Pangai from 1990 to 1995, during which he participated in peacekeeping operations in Bougainville.

[8] In 2004, several Members of Parliament (MPs) advocated for his resignation as prime minister following their decision to boycott the inauguration of the Tonga Legislative Assembly.

[9] Among the MPs was Feleti Sevele, who cited the closure of Royal Tongan Airlines as one of several adverse events associated with the prime minister's tenure.

[11] His departure coincided with a period of heightened civil unrest, as pro-democracy protests advocating for a reduced governmental role of the royal family gained traction from mid-2005 onward.

[20] On 25 August 2017, Tupou VI dismissed Prime Minister ʻAkilisi Pōhiva, dissolved the Legislative Assembly, and ordered early elections to be held by mid-November.

Lord Tuʻivakanō stated that Pōhiva had made unconstitutional moves, including signing international agreements without the King's consent.

[22] On 15 January 2022, the King was temporarily relocated from the Royal Palace following the eruption of Hunga Tonga–Hunga Haʻapai and the ensuing tsunami.

[28][29] In response to the revocation of their appointments, Siaosi Sovaleni and Fekitamoeloa ʻUtoikamanu publicly announced their resignation from their respective ministerial positions in April 2024.

[36] Their second child, Crown Prince Tupoutoʻa ʻUlukalala (Siaosi Manumataongo ʻAlaivahamamaʻo ʻAhoʻeitu Konstantin Tukuʻaho), born on 17 September 1985, married his second cousin, Sinaitakala Fakafanua, on 12 July 2012.