Constantine Made Sunday a Roman Day of Rest

In AD 321 the Roman emperor Constantine I issued the first civil law setting aside a weekly day of rest. Preserved in the Codex Justinianus (III.12.2), the decree ordered judges, city dwellers, and tradespeople to pause work on the dies Solis — the “day of the Sun.”

“On the venerable Day of the Sun let the magistrates and people residing in cities rest, and let all workshops be closed.”

The rule was not absolute. Farmers were exempt, free to keep sowing grain or planting vines, since a missed sowing season could not be recovered. The choice of day was shrewdly ambiguous: Sunday honored the popular sun god Sol Invictus while also marking the Christian day of resurrection, letting Constantine appeal to pagans and Christians at once.

The measure helped embed a recurring public pause into the seven-day week, a rhythm that spread with Christianity across the later empire and shaped the Western calendar. Later emperors added further restrictions, but Constantine’s brief edict is remembered as the legal ancestor of the modern day off.