As the power of the Roman Empire faded in the first centuries of the Common Era, the practice of worshiping the Emperor and Roman gods slowly became less prevalent. A new faith, Christianity, developed from Judaism, a religion practiced in, a remote outpost of the Empire called Judea.
After the death of a holy man named Jesus about 30CE, his followers spread the message of Christianity to cities throughout the Empire. In Christianity’s early history, it was a Roman citizen’s civic obligation to honor the Emperor and the Roman pantheon of gods and goddesses. The Roman government often persecuted Christians because the Christians believed honoring anything but their one God would lead to damnation. Emperor Nero blamed Christians for starting the Great Fire of Rome in 64CE. Emperor Decius declared Christians to be “enemies of Rome." There are stories of Roman officials ordering Christians thrown to wild beasts for refusing to renounce their faith. Despite the efforts by Roman authorities at suppressing it, Christianity continued to grow.
Over time, many traditional Roman practices merged with Christian celebrations. Christians began to celebrate the birth of Jesus in December when Romans traditionally celebrated the birth of the sun after the longest night of the year.
In 311, Emperor Constantine decreed that Christians could practice their beliefs without oppression. By 325, he called Church leaders to a meeting in Nicaea, in present day Turkey, to standardize Christian teaching throughout the empire.
Forty-three years after Constantine’s death, Emperor Theodosius declared Christianity to be the official religion of the Empire. The standards set by Constantine at Nicea were to be considered official, and all other Christian teachings were heresy. Heresy is a belief that contradicts or defies established religious teachings. Because Christianity had developed independently in cities throughout the Empire, there was a diversity of beliefs among the faithful. After Nicean Christianity became the official religion of the empire, people who practiced heretical beliefs often faced punishment or death.
Christianity spread past the borders of the Roman Empire to barbarian lands. The faith spread to present-day France after Frankish king Clovis I became a Christian in 496. By the seventh century, missionaries spread their beliefs to Great Britain, the last outpost of Western Europe to accept Christianity.
Religious life was often the only way to get an education in Western Europe during the Middle Ages. It also allowed poor people to escape a dreary life and possibly rise to power. Some Christians renounced their possessions and lived apart from the rest of society. Men lived as monks in monasteries and women as nuns in convents. A fifth-century monk now called St. Benedict established strict rules for monasteries, including when monks should eat, pray, and work. Often the younger sons of nobles or widowed women would leave the stress of the everyday life for the care and comfort they found in monasteries and convents.
Monasteries produced many well-educated men prepared to serve as administrators for uneducated kings and lords. Some Monks copied books by hand in an era before the printing press. The Christian Bible was the only book in many smaller villages in Western Europe. Often the only person in a village capable of reading the Bible was a Christian priest.
People did not think of Europe as a distinct place until after the Middle Ages. Instead, they spoke of “Christendom," or the community of Christians. Christianity was the most important influence of the Middle Ages in Western Europe. By 800, Christianity had become the faith of almost all of the people of Western Europe.
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Mr. Donn has an excellent website that includes a section on the Middle Ages.