Constantine the Great vs Esarhaddon

Constantine defeated his rival Maxentius at the Milvian Bridge near Rome. According to tradition, Constantine saw a vision of a cross in the sky with the words 'In this sign, conquer.' The victory made Constantine the sole ruler of the Western Roman Empire and led to his conversion to Christianity.

Constantine and his co-emperor Licinius issued the Edict of Milan, granting religious toleration to all religions in the Roman Empire, including Christianity. The edict ended the persecution of Christians, restored confiscated church property, and established Christianity as a legally recognized religion.

Constantine defeated his co-emperor Licinius at the battles of Adrianople and Chrysopolis, ending the Tetrarchy system. He became the sole ruler of the entire Roman Empire, reuniting the Western and Eastern halves under his control. This reunification was the last time the Roman Empire was united under a single ruler.

Constantine convened the First Council of Nicaea, the first ecumenical council of the Christian Church, to resolve the Arian controversy over the nature of Christ. The council produced the Nicene Creed, affirming the divinity of Christ and establishing a unified Christian doctrine. Constantine presided over the council.

Constantine dedicated the city of Constantinople (modern Istanbul) as the new capital of the Roman Empire, built on the site of the ancient Greek city of Byzantium. The city was strategically located on the Bosporus strait, controlling trade routes between Europe and Asia. It became the capital of the Eastern Roman Empire for over a thousand years.

Esarhaddon reversed his father Sennacherib's destruction of Babylon. He ordered the reconstruction of the city, its temples, and the Esagila. He returned the statue of Marduk and granted Babylon privileges, seeking to heal the religious rift caused by his father.

Esarhaddon defeated the Cimmerian invaders in the region of Hubushna (Anatolia). The Cimmerians had been threatening Assyrian vassals. This victory secured the northern frontier of the Assyrian Empire for a time.

Esarhaddon imposed loyalty oaths on his subjects, officials, and vassal states, requiring them to swear allegiance to his chosen heir Ashurbanipal. These treaties were inscribed on tablets and included curses for violation. They ensured a smooth succession.

Esarhaddon led the Assyrian army across the Sinai desert and defeated the Kushite Pharaoh Taharqa. He captured Memphis and took the Egyptian royal family hostage. This was the first time an Assyrian king ruled Egypt, though control was brief.