In the year of our Lord’s Incarnation 156, Marcus Antoninus Verus, fourteenth from Augustus, became Emperor jointly with his brother Aurelius Commodus. During their reign, and while the holy Eleutherus ruled the Roman Church, Lucius, a British king, sent him a letter, asking to be made a Christian by his direction.1 This pious request was quickly granted, and the Britons received the Faith and held it peacefully in all its purity and fullness until the time of the Emperor Diocletian.
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This story is borrowed from the Liber Pontificalis, but it really refers to Lucius, King of Edessa and to one of his castles called Britium. But this legend had a very long life; see ODCC, S.V. ↩