Constantine: The Sole Emperor of the Roman Empire
Constantine is remembered as the sole emperor of the Roman Empire for several key reasons:

Conversion to Christianity
Constantine played a significant role in the history of Christianity by becoming the first Roman emperor to convert to Christianity. His conversion had a lasting impact on the Roman Empire, as he issued the Edict of Milan in 313 AD, which granted religious tolerance to Christians and paved the way for the legalization of Christianity.

Foundation of Constantinople
Constantine established the city of Constantinople (modern-day Istanbul) as the new capital of the Roman Empire in 330 AD. This strategic move shifted the center of power from Rome to the eastern part of the empire, leading to the city's prominence as a cultural and economic hub for centuries to come.

Political and Military Reforms
Constantine implemented various political and military reforms during his reign, such as the division of the empire into eastern and western regions for better governance. He also introduced the solidus, a new gold coin that stabilized the economy and helped fund his military campaigns.

Victory at the Battle of the Milvian Bridge
One of Constantine's most famous victories was at the Battle of the Milvian Bridge in 312 AD, where he defeated his rival Maxentius and secured his position as the sole emperor of the Roman Empire. This battle marked a turning point in Roman history and solidified Constantine's power.

Legacy and Influence
Constantine's reign marked a crucial period of transition in the Roman Empire, as he ushered in a new era of Christianity and established Constantinople as a thriving imperial capital. His religious and political decisions had a lasting impact on the empire and helped shape the course of Western civilization.