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Also in his own words.

Constantine instituted several legislative measures regarding the Jews: they were forbidden to own Christian slaves or to circumcise their slaves. Conversion of Christians to Judaism was outlawed. Congregations for religious services were restricted, but Jews were allowed to enter Jerusalem on Tisha B'Av, the anniversary of the destruction of the Temple. Constantine also supported the separation of the date of Easter from the Jewish Passover (see also Quartodecimanism), stating in his letter after the First Council of Nicaea: "... it appeared an unworthy thing that in the celebration of this most holy feast we should follow the practice of the Jews, who have impiously defiled their hands with enormous sin, and are, therefore, deservedly afflicted with blindness of soul. ... Let us then have nothing in common with the detestable Jewish crowd; for we have received from our Saviour a different way." [6]. Theodoret's Ecclesiastical History 1.9 records the Epistle of the Emperor Constantine addressed to those Bishops who were not present at the Council: "It was, in the first place, declared improper to follow the custom of the Jews in the celebration of this holy festival, because, their hands having been stained with crime, the minds of these wretched men are necessarily blinded. ... Let us, then, have nothing in common with the Jews, who are our adversaries. ... avoiding all contact with that evil way. ... who, after having compassed the death of the Lord, being out of their minds, are guided not by sound reason, but by an unrestrained passion, wherever their innate madness carries them. ... a people so utterly depraved. ... Therefore, this irregularity must be corrected, in order that we may no more have any thing in common with those parricides and the murderers of our Lord. ... no single point in common with the perjury of the Jews."

These quotes pretty much settles the argument as far as I am concerned.