Tonga: Heads of State: 1875-2024 - Archontology
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Tonga: Heads of State: 1875-2024

ʻi he Kelesi ʻa e ʻOtua ko e Tuʻi ʻo e Puleʻanga ʻo Tonga = By the Grace of God, King of the Kingdom of Tonga
4 Nov 1875 - 18 Feb 1893 Siaosi Tupou I = George Tupou I (Maeʻakafa Ngininginiofolanga Tāufaʻāhau Tupou) [1]
18 Feb 1893 - 5 Apr 1918 Siaosi Tupou II = George Tupou II (Siaosi Tāufaʻāhau Tupou)
5 Apr 1918 - 16 Dec 1965 Sālote Tupou III = Salote Tupou III (Sālote Mafileʻo Pilolevu Veiongo Tupou) [2]
16 Dec 1965 - 11 Sep 2006 Tāufaʻāhau Tupou IV = Taufaʻahau Tupou IV (Siaosi Tāufaʻāhau Tupoulahi Tupou) [3]
11 Sep 2006 - 18 Mar 2012 Siaosi Tupou V = George Tupou V (Siaosi Tāufaʻāhau Manumataʻongo Tukuʻaho Tupou)
18 Mar 2012 - Tupou VI (ʻAhoʻeitu ʻUnuakiʻotonga Tukuʻaho)

[1] Original name: Maeʻakafa Ngininginiofolanga; later Tāufaʻāhau added; Siaosi = George from 7 Aug 1831; becomes Tuʻi Kanokupolu and acquires clan name Tupou 4 Dec 1845.
[2] Tuʻi informally replaced by Kuini for a female ruler.
[3] 10 Sep 2006 at place of death (New Zealand).