>> “which pagan dictator are you talking about” <<
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Constantine.
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>> “and what was the reaction from the Christians when he did this?” <<
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They either suffered under his tyranny, or migrated on to a place where they could worship the Lord.
Tradition / Church Fathers
On the Lord’s own day, assemble in common to break bread and offer thanks, but first confess your sins so that your sacrifice may be pure.” Didache, 14 (A.D. 90).
“If, therefore, those who were brought up in the ancient order of things have come to the possession of a new hope, no longer observing the Sabbath, but living in the observance of the Lord’s Day, on which also our life has sprung up again by Him and by His death—whom some deny, by which mystery we have obtained faith, and therefore endure, that we may be found the disciples of Jesus Christ, our only Master.” Ignatius, To the Magnesians, 9:1 (A.D. 110
you better study a little harder Church history. the Didache, written in the late first century and at the time some believed to be Scripture, says to assemble on the “Lord’s Day”, i.e. the first day of the week, or as we know it today, Sunday.
St Ignatius, taught by the Apostle John, said the Church no longer observed the Sabbath in his day, again late first century.
the “pagan dictator” would not live for another 200 years!
who suffered under his tyranny or migrated to another place, this is just made up hocus pocus, NOT SUPPORTED BY HISTORY.
again, i request you to show me from the NT where the Corinthian Church kept the 7th day sabbath.