Abbas I vs Constantine the Great

Abbas I created a standing army of ghulams (military slaves) recruited from Christian subjects in the Caucasus, particularly Georgians and Armenians. This reduced reliance on the Qizilbash tribal forces, increased royal control, and modernized the military with firearms and artillery.

Abbas I moved the Safavid capital from Qazvin to Isfahan, transforming it into a magnificent city with grand architecture, including Naqsh-e Jahan Square, the Shah Mosque, and the Ali Qapu Palace. This relocation became a symbol of Safavid power and cultural flourishing.

Abbas I sent diplomatic missions to European courts, including those of Philip III of Spain, Rudolf II of the Holy Roman Empire, and Elizabeth I of England, seeking alliances against the Ottoman Empire. These missions opened sustained diplomatic and commercial exchanges between Safavid Persia and Europe.

Abbas I defeated an Ottoman army near Sufiyan, securing Safavid control over Azerbaijan and the Caucasus. This victory was part of the Ottoman-Safavid War of 1603-1618, which resulted in the recapture of Tabriz, Nakhchivan, and Yerevan from Ottoman occupation.

Abbas I, with support from the English East India Company, captured the island of Hormuz from Portuguese control. This ended Portuguese dominance in the Persian Gulf and opened direct trade routes for Safavid Persia with Europe, boosting the silk trade.

Abbas I captured Baghdad from the Ottoman Empire after a siege, restoring Safavid control over Iraq. This victory expanded Safavid territory and gave Abbas control over important Shi'a pilgrimage sites like Najaf and Karbala.

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.