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to personality of some other emperors or historical figures. However, the specific of history as a science is that there is never enough information and there is always something hidden from historians that a researcher should guess about, presuppose and build his own theories lacking the necessary quantity of information and at this respect simple logic may be at help.
But, returning to the primary sources concerning Constantine I and his epoch, there could be named several among which the most important seem to be the works of those who lived at the same historical period as Constantine I did. Namely, they are Lactantius and Eusebius, who were historians contemporary of Constantine’s reign. As for their works there may be named several of them. For instance, Lactantius is famous for his work “The Death of Persecutors”, whereas Eusebius wrote two major work about the emperor Constantine I, they are “In Praise of Constantine” and “Church History”. Also the works of Socrates and Sozomen, which have the same title “Church History”, may be at use for a researcher.
It is noteworthy that such a big quantity of primary sources are associated with the church history. It is not surprisingly because Constantine I produced probably the greatest impact on the religion of all Europeans and not only of the Middle Ages but even Renaissance and later epochs as well.
However, it is also should be pointed out that the emperor himself also lived some sources that are extremely useful for historians, for instance, his “To the Assembly of the Saints” also conveys a lot of interesting facts and information about Constantine’s views on religion and his policy in this field. At this paper some of the works mentioned above would analyzed in the context of the influence of the emperor Constantine I the Great on the Medieval European history.
There is no doubt that the most outstanding event that occurred in the reign of Constantine I was the transformation of Christianity into official state religion. Many historians both contemporary and ancient put this event on the first place among all the deeds that had ever been done by the emperor.

It is obvious that the choice of Christianity as the official religion of the whole empire produced a significant impact on the future Medieval history of all European continent both western and eastern and shaped not only European religion of the Middle Ages but European philosophy and culture as well.
Consequently, it is necessary to analyze what made the emperor to make such a step and what were the conditions and circumstances that led him to such a decision. At this respect, the primary sources of the historians, which were contemporary of Constantine’s reign, are extremely important.
However, it should be pointed out that during his life Constantine the Great several times radically changed his views on religion and policy related to this aspect of life within his empire. At the same time, he tended to be close to deity, to something divine. In this context quite remarkable are words of Eusebius in “The Conversion of Constantine” where the author states that the emperor was convinced that “he needed some more powerful aid than his military forces could afford him, on account of the wicked and magic enchantments which were so diligently practiced by the tyrant, he sought Divine assistance, deeming the possession of arms and a numerous soldiery of secondary importan