The emperor Constantine changed the world by making the Roman Empire Christian. Eusebius wrote his life and preserved his letters so that his policy would continue. This English translation is the first based on modern critical editions. Its Introduction and Commentary open up the many important issues the Life of Constantine raises.
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Pretty enjoyable chronicle of Constantine's reign written by his hypeman. Thankfully its fairly short as it tends to drag on a bit. You can only hear about how pious and good Constantine was until it gets repetitive.
There are still a lot of interesting historical details however, which is why i would still recommend checking this out. The Roman empire's christianization is a fascinating subject and this is probably one of the best primary sources for it.