What was the first European country to convert to Christianity?

Answer 1

In its early years, Christianity spread slowly from Judea to other parts of the Roman Empire. By the time of Emperor Constantine, at the beginning of the fourth century, it is estimated that around ten percent of the population of the empire were Christians. Final conversion of the citizens of the empire to Christianity resulted from imperial decree, rather than 'conversion' as we normally use the term. Towards the end of the fourth century, Christianity was decreed to be the state religion. The orthodox-catholic Christian Church was given the power to confiscate the temples and all temple property belonging to pagans and Mithraists, and to enforce conversion to orthodox-catholic Christianity. So conversion to Christianity should be seen in empire-wide terms, rather than a country by country mission.