fifteen years being considered long by the standards of the 3rd century Roman Empire.

Uprisings after the defeat of Valerian

After Valerian's defeat and capture by the Persians in 260, his son Gallienus became the only emperor. However, many uprisings happened, both in the East, with the formation of the Palmyrene Empire, and in the West, with the birth of the Gallic Empire.

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