“The retention of the old Pagan name of ‘Dies Solis,’ or ‘Sunday,’ for the weekly Christian festival, is, in great measure, owing to the union of Pagan and [so-called] Christian sentiment with which the first day of the week was recommended by Constantine [in an edict in 321 C.E.] to his subjects, Pagan and Christian alike, as the ‘venerable day of the Sun.’ . . . It was his mode of harmonizing the discordant religions of the Empire under one common institution.”—Lectures on the History of the Eastern Church (New York, 1871), A. P. Stanley, p. 291.
Reasoning From the Scriptures. 1985, 1989 ed. p. 346