Saloninus was promoted to Caesar after the death of his brother Valerian II. He was sent to the Rhine frontier but got into an argument with Postumus, the commander of the Rhine armies, over some captured barbarian booty. When Valerian I was captured by Shapur, the Persian king, Postumus had the German legions proclaim him emperor. Saloninus had his headquarters at Cologne, an important Roman frontier town that later became an important German city. Postumus laid siege to Cologne, and the garrison within the town elevated Saloninus to Augustus. Soon, however, the garrison surrendered the town. Postumus summarily put Valerian II to death.
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