"' Lex Constantini a. 321 (Cod. Just. 1. iii., Tit. 12, 3): Imperator Constantinus Aug. Helpidio : " Omncs judices, urbanscque plebes et cunctarum artium officia venerabili die Solis quiescant. Ruri tamen positi agrorum culturte libere licenterque in serviant, quonJam frequenter cvcnit, ut non aptius alio die frumenta sulcis aut viueae Bcrobibus mandentur, ne occasioue momenti pcrcat commoditas coelesti provisione concessa. Pat. Non. Mart. Crispo ii. et Constantino ii. Coss." In English: "On the venerable Day -of the Sun let the magistrates and people residing in cities rest, and let all workshops be closed. In the country, however, persons engaged in agri culture may freely and lawfully continue their pursuits ; because it often happens that another day is not so suitable for grain-sowing or for vine-planting ; lest by ne^lectin"' the proper moment for such operations the bounty of heaven should be lost. (Given the 7th day of March, Crispus and Constantine being consuls each of them for the second time.)" The prohibition of military exercises is mentioned by Eusebius, Vita Const. IV. 10, 20, and seems to refer to a somewhat later peiiod. In this point Constantine was in advance of modern Christian princes, who prefei Sunday for parades. * Cod. Theod. 1. ii. tit. 8, 1 : " S "
This is the quote that I made reference to. As you can see he does not say it is the day of Christian Worship. Maybe someone can uncover the full text for us.