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alternatehistory.com
Like it saids in the title. What if the last emperor of a unified Rome made it 30 more years dying at 78. Can he make his sons competent in that time? Who would he make his successor if his sons die on schedule before him? How would he shape the empire and its army to fight its enemies? How can he improve tax collection and law in 30 years (let's say he is in a reforming mood in his last 30 years)? How does history change?
Scenario 2: On top of the 30 years both of his son are very competent men. When Honorius reaches his majority he rules the prefecture of Gaul from trier to defend the Rhine. Arcadius the prefecture of the east from Antioch to protect against the Persian. And theodosius himself rules the middle two prefectures from Milan to protect the Danube. They all work tougther to preserve the empire.