Constantine the Great vs Tokugawa Ieyasu

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.

Tokugawa Ieyasu led the Eastern Army to victory over Ishida Mitsunari's Western Army at Sekigahara. This decisive battle ended the Sengoku period and established Ieyasu as the supreme military ruler of Japan, paving the way for the Tokugawa shogunate.

Emperor Go-Yozei appointed Tokugawa Ieyasu as shogun, officially beginning the Tokugawa shogunate. Ieyasu established his government in Edo (modern Tokyo), centralizing military and political power under his family's control.

Tokugawa Ieyasu besieged Osaka Castle, the stronghold of Toyotomi Hideyori. The castle fell, and Hideyori committed suicide. This campaign eliminated the last major opposition to Tokugawa rule, solidifying the shogunate's control over Japan.

Ieyasu issued the Laws for the Military Houses, a code regulating the conduct of daimyo. It restricted castle construction, required alternate attendance in Edo, and prohibited alliances without shogunal permission. This law helped control the feudal lords.

In his final years, Ieyasu began policies that led to Japan's isolation. He restricted foreign trade to specific ports and expelled Christian missionaries. These measures, expanded by successors, resulted in the sakoku policy that isolated Japan for over 200 years.