Which monarch had the longest reign in world history?

5th place: Mirian III of Iberia Mirian III was the 22nd monarch and a king of Iberia or Kartli (Georgia). He was born around c. 277 into the house of Mihran, which was one of the seven great houses of Iran. He reigned from 284 – 361 (77 years) taking over from Aspacures I of …

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