“Sunday, the first day of the week. In ancient times it was the day on which the sun was worshipped. In the early days of the Church Christians began to observe the first day of the week in honour of the resurrection in addition to keeping the seventh-day Sabbath of the Decalogue. Gradually the seventh-day Sabbath was abandoned and the first day adopted, though without any Biblical authority, as the Christian rest day. The first Sunday law was that of Constantine the Great in A.D. 321, in which it was decreed that all should rest from their labours upon the “venerable day of the sun.” – Pears Cyclopaedia Sixty-First Edition p. 652, 653