Aurelian

Arguably the greatest roman emperor, who singlehandedly saved the Empire from the brink of collapse during the Crisis of the 3rd Century, he was a legendary general who crushed all and every enemy of the Romans, annihilated the Goths, crushed the vandals, defeated any usurpers, unconquered the broken away lands of Gallic and Palmyrene Empire, stabilized the economy, cleansed corruption, built the Aurelian walls, and that too in merely 5 years
However, his subordinates thought he was too OP and then assassinated him, if he had ruled longer we all would be speaking latin now

There was no greater man. No more resplendent hero. The warrior king of legend, the greatest of all heroes. The saviour of mankind. Aurelian was beyond chad. Beyond hero. Beyond saviour. He was the greatest that any man has ever been
-Some Guy in Unbiased history wiki