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24x10 inch landscape timeline diagram of the Christianization of the Roman Empire: horizontal time axis 200 CE to 450 CE with key events marked: (1) c. 30-100 CE Apostolic age — Jesus, Paul's letters, Gospels composed; (2) 64 CE Nero's persecution; (3) c. 100-300 CE Christianity spreads as one Mediterranean religion among many; (4) 250 CE Decian persecution; (5) 303 CE Diocletian's Great Persecution; (6) 312 CE Battle of Milvian Bridge — Constantine's victory + reported vision; (7) 313 CE Edict of Milan — toleration of Christianity; (8) 325 CE Council of Nicaea — Nicene Creed formulated; (9) 337 CE Constantine baptized on deathbed; (10) 361-363 CE Julian 'the Apostate' restores polytheism briefly; (11) 380 CE Theodosius's Edict of Thessalonica — Nicene Christianity established as state religion; (12) 391 CE Theodosius bans polytheist sacrifices; (13) 415 CE death of Hypatia of Alexandria in Christian-pagan-Jewish urban conflict. Visual cue: Christianity band starts thin (~10% of empire c. 300 CE) and widens to dominant (~85% c. 450 CE per Stark/Hopkins demographic estimates). Parallel band: polytheist state cults shown declining. Vertical gridlines every 25 years. Style: clean educational, full-color, 24x10 print resolution.