Leo I was a Byzantine Emperor who ruled from 457 to 474 AD. He is also known as Leonardo or Leo the Great. There are several synonyms for the name Leo I, including Leo the Great, Leo Magnus, and Leo the First. These names are used interchangeably to refer to the same historical figure. Leo's reign was marked by several military victories, religious reforms, and administrative changes. He strengthened the authority of the imperial office and implemented legal reforms that had far-reaching consequences for Byzantine society. As a result, Leo I is often regarded as one of the most significant Byzantine Emperors of all time.