Events By Place Roman Empire Goths invade Asia Minor. Dacia's lost for the Roman Empire. Emperor Valerian persecutes Christians. The Franks cross the Rhine, the Alamanni reach Milan. Cities in the Roman Empire begin to build walls as the defense of the frontiers begins to crumble. The Goths appear at the walls of Thessalonica. In Africa, the Berbers massacre Roman colonists. The future emperor Aurelian inspects and organizes the defenses along the Rhine. Persian king Shapur overruns Me… (More on 256)