Watt introduced a design enhancement, the separate condenser, which avoided this waste of energy and radically improved the power, efficiency, and cost-effectiveness of steam engines. Eventually he adapted his engine to produce rotary motion, greatly broadening its use beyond pumping water.
Constantine reigned during the 4th century CE and is known for attempting to Christianize the Roman Empire. He made the persecution of Christians illegal by signing the Edict of Milan in 313 and helped spread the religion by bankrolling church-building projects, commissioning new copies of the Bible, and summoning councils of theologians to hammer out the religion's doctrinal kinks. Constantine was also responsible for a series of important secular reforms that ranged from reorganizing the Roman Empire's currency system to restructuring Rome's armed forces. His crowning achievement was his dedication of Constantinople as his new imperial capital in 330.
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The Indian Ocean slave trade, sometimes known as the East African slave trade or Arab slave trade, was the multi-directional slave trade and has changed over time. Africans were sent as slaves to the Middle East, to Indian Ocean islands (including Madagascar), to the Indian subcontinent, and later to the Americas.
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