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235 –285 Border conflicts and secessions from parts of the empire lead to a crisis. In rapid succession soldier emperors strengthen the military at the expense of the civilian population. 250 –300 Gradual decline of the urban settlement outside the fortress and the civilian town of Vindobona; a landslide destroys large parts of the legionary fortress and the urban settlement. 284 –313 Emperor Diocletian divides imperial authority among four individuals (Tetrarchy) and decrees comprehensive reforms. Vindobona is now part of the province of Pannonia Prima. 306 –337 Under Emperor Constantine I, the legionary fortress changes into a fortress town. The civilian population completely withdraws behind the walls. 313 Recognition and advancement of Christianity through the Edict of Milan. Around 350 Catastrophic earthquakes in Carnuntum and possibly in Vindobona as well. 364 –375 Massive reinforcement of the fortifications along the NoricPannonian Limes under Emperor Valentinian I, so in Vindobona as well. 350 –400 In the Notitia Dignitatum – a late Roman government register – Vindobona is mentioned as a legionary and naval base. 378 Emperor Valens is defeated at the Battle of Adrianople by the Goths. After this, the settlement of Huns and East Germanic allies (foederates) in Pannonia increases, and possibly in the Vienna area as well. 395 Invasion of the Marcomanni and the Quadi. Further settlement of allied Germanic people in the Roman area. Around 395 – ca. 430 The military-structured administration of Vindobona dissolves gradually. Further settlement is documented. After 430 In the Roman settlement area of Vindobona, no further archaeo logical evidence of a settlement can be found until approximately the 9th/10th century A.D.