It was Constantine what done it

[Kendall K. Down]

I have been told, since an early age, that it was Constantine who
introduced the observance of Sunday. I went along with it, as the people
who made the statement appeared authorative. However I am glad to have
found the first-hand evidence, rather than second-hand, however authorative.

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Chapter XVIII - He enjoins the General Observance of the Lord's Day,
and the Day of Preparation.

He ordained, too, that one day should be regarded as a special occasion
for prayer: I mean that which is truly the first and chief of all, the
day of our Lord and Saviour. The entire care of his household was
entrusted to deacons and other ministers consecrated to the service of
God, and distinguished by gravity of life and every other virtue: while
his trusty body guard, strong in affection and fidelity to his person,
found in their emperor an instructor in the practice of piety, and like
him held the Lord's salutary day in honour and performed on that day the
devotions which he loved. The same observance was recommended by this
blessed prince to all classes of his subjects: his earnest desire being
gradually to lead all mankind to the worship of God. Accordingly he
enjoined on all the subjects of the Roman empire to observe the Lord's
day, as a day of rest, and also to honour the day which precedes the
Sabbath; in memory, I suppose, of what the Saviour of mankind is
recorded to have achieved on that day. And since his desire was
to teach his whole army zealously to honour the Saviour's day (which
derives its name from light, and from the sun),[271] he freely
granted to those among them who were partakers of the divine faith,
leisure for attendance on the services of the Church of God, in order
that they might be able, without impediment, to perform their religious
worship.

[271] [The decree of Constantine for the general observance of Sunday
appears to have been issued A.D. 321, before which time both "the old
and new sabbath" were observed by Christians. "Constantine (says
Gibbon, ch. 20, note 8) styles the Lord's day Dies solis, a name which
could not offend the ears of his Pagan subjects." - Bag.] This has been
urged as ground for saying that Constantine did not commit himself to
Christianity until the end of life, but it only shows his tact and care
in treating the diverse elements of his empire.
Eusebius, "Life of Constantine"

10. He commanded too, that one day should be regarded as a special
occasion for religious worship; I mean that which is truly the first
and chief of all, the day of our Lord and Saviour; that day the name of
which is connected with light, and life, and immortality, and every
good.
Eusebius, "Oration"
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You will notice the editor's note 271.

A shame that it wasn't Jesus or His apostles that changed the day; I
might accept their authority, but I certainly don't accept Constantine
as having the authority to change the law of God.

God bless,
Kendall K. Down