As of April 2025, who was the longest-reigning monarch of a non-sovereign state in history?

Correct answer: Sobhuza II

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What people think about it: 1 Comment
AnaYelisa
AnaYelisa
The longest-reigning King of Thailand was Bhumibol Adulyadej (Rama IX), who reigned for 70 years and 126 days, from 1946 until his death in 2016. He is the longest-serving monarch in the Chakri dynasty. Given his popularity in our modern history, I believe he should count!