In the winter of 367 Britannia was hit from all sides by a coordinated barbarian invasion. It would be more than a year before the Romans were able to reassert control over the island.

Shortly after Valentinian and Valens ascended to the throne, one of Julian the Apostate's maternal cousins seized control of Constantinople.

Jovian extracted the Roman legions from the east at a heavy price. He then ruled the Empire for eight months before suddenly dying on his way to Constantinople in early 364.

In 363 Julian launched an invasion of Sassanid Persia. He would die in battle just three months later.