Who was the last Roman emperor in the Year of Four Emperors (69 AD)?

The story behind the answer

Vespasian is correct: after Nero’s death sparked civil war, three short‑lived emperors—Galba, Otho, and Vitellius—rose and fell in 69 AD. Commanding forces in Judaea, Vespasian was proclaimed emperor by the eastern legions, secured Egypt’s grain supply, and his general Antonius Primus defeated Vitellius at Rome in December. He then founded the Flavian dynasty and re‑stabilized the empire (r. 69–79), repairing finances and beginning the Colosseum.

To remember the sequence, think “Galba, Otho, Vitellius—Vespasian victorious” (G‑O‑V‑Ve): the first three go, and Vespasian stays. His reign ended the turmoil of the Year of Four Emperors and restored order.