Aurelian

Aurelian defeated the Juthungi and Alamanni tribes who had invaded Italy, driving them back across the Danube. He also abandoned the province of Dacia, resettling its population south of the Danube to create a more defensible frontier.

Aurelian ordered the construction of a massive defensive wall around Rome, the Aurelian Walls, to protect the city from barbarian invasions. The walls were 19 kilometers long and remained in use for centuries.

Aurelian defeated the Gallic Empire under Tetricus I at the Battle of Ch

Aurelian reformed the Roman currency, introducing a new silver coin (the antoninianus) with a higher silver content to combat inflation. He also attempted to stabilize prices and improve the economy, though with limited long-term success.

Aurelian was assassinated by his own officers while on campaign against the Sassanid Empire, due to a conspiracy involving a secretary who feared punishment. His death cut short his plans for further reforms and campaigns.