Christianity
A religion centered on the belief that Jesus of Nazareth is the Christ; it began in first-century Palestine and later divided into Catholic, Orthodox, and Protestant branches.
By ISO standard, the week starts on Monday. "Weekend" (週末) literally means "week's end," placing Saturday and Sunday last. Yet many countries start on Sunday—because in 321 CE, Constantine I made it a rest day, and "work then rest" felt more natural.
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Medieval Europeans believed for centuries that "Prester John," a Christian king, ruled a powerful kingdom in Asia. This legend drove Prince Henry of Portugal to launch expeditions around Africa, helping catalyze the Age of Discovery.
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