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Emperor Constantine I decreed that Sunday, the day honoring the sun god Sol Invictus (disc pictured), would be the Roman day of rest.
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Constantine the Great
Roman emperor from 306 to 337
Constantine I, also known as Constantine the Great, was a Roman emperor from AD 306 to 337 and the first Roman emperor to convert to Christianity. He played a pivotal role in elevating the status of Christianity in Rome, decriminalising Christian practice and ceasing Christian…Source: Wikipedia (CC BY-SA)
Sol Invictus
Late Roman solar deity
Sol Invictus was the official sun god of the late Roman Empire and a later aspect of, or replacement for, the old Latin god Sol. The emperor Aurelian revived his cult in 274 AD and promoted Sol Invictus as the chief god of the empire. From Aurelian onward, Sol Invictus often…Source: Wikipedia (CC BY-SA)