jan 1, 321 - Constantine Declares Sunday , "the
venerable day of the Sun" as Sabbath
Description:
In the year 321 A.D., Constantine decreed, "On the venerable day of the Sun let the magistrates and people residing in cities rest, and let all workshops be closed" (Codex Justinianus lib. 3, tit. 12, 3; trans. in Philip Schaff, History of the Christian Church, Vol. 3, p. 380, note 1).
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