[ravenwolf]

both those who have purchased and those who have secured them by gift, are to appeal to the vicar if they seek any recompense from our bounty, that they may be cared for through our clemency,.

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It seems the vicar is some one with authority but at the same time it looks like the Christians are the ones who had been persecuted against So was the vicar a Christian or a Roman official.

Plainly freedom of religion, but Constantine does not seem to be identified as a Christian.

[annalex]

So was the vicar a Christian or a Roman official.

The vicar generally refers to Christian clergy, but I cannot say for sure.

Constantine does not seem to be identified as a Christian.

Not in this document, but that is understandable that in this context he only needs to be identified as Western Emperor. However, it si also true that St. Constantine did not become Christian till on his deathbed, as he had been advised not to get baptized while he was still in charge of armies, etc. (Wiki)