Yes, Thomas Jefferson had defeated pirates from North Africa during the Barbary War. He was responsible for doubling the size of the United States by successfully brokering the Louisiana Purchase. He also founded the University of Virginia. As well as was the founder of the Declaration of Independence.
When Diocletian realized that the empire was too big to run, he split the empire into four regions. This helped to restore order in the empire and also to reform it. His reign stabilized the empire and marked the end of the Crisis of the Third Century
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