History of Christian thought on persecution and tolerance

The history of Christian thought has included concepts of both inclusivity and exclusivity from its beginnings, that have been understood and applied differently in different ages, and have led to practices of both persecution and toleration. Early Christian thought established Christian identity, defined heresy, separated itself from polytheism and Judaism and invented supersessionism. In the centuries after Christianity became the official religion of Rome, some scholars say Christianity became a persecuting religion. Others say the change to Christian leadership did not cause a persecution of pagans, and that what little violence occurred was primarily directed at non-orthodox Christians. After the fall of the Roman Empire, Christian thought focused more on preservation than origination. This era of thought is exemplified by Gregory the Great, Saint Benedict, Visigothic Spain, illustrated manuscripts, and progress in medical care through monks. Although the roots of supersessionism and deicide can be traced to some second century Christian thought, Jews of the Middle Ages lived mostly peacefully alongside their Christian neighbors because of Augustine of Hippo's teaching that they should be left alone. In the Early Middle Ages, Christian thought on the military and involvement in war shifted to accommodate the crusades by inventing chivalry and new monastic orders dedicated to it. There was no single thread of Christian thought throughout most of the Middle Ages as the church was largely democratic and each order had its own doctrine. The High Middle Ages were pivotal in both European culture and Christian thought. Feudal kings began to lay the foundation of what would become their modern nations by centralizing power. They gained power through multiple means including persecution. Christian thought played a supportive role, as did the literati, a group of ambitious intellectuals who had contempt for those they thought beneath them, by verbally legitimizing those attitudes and actions.