After the dissolution of the Roman Empire, the idea arose of Europe as one large church-state, called Christendom. Christendom consisted of two distinct groups of functionaries: the sacerdotium, or ecclesiastical hierarchy, and the imperium, or secular leaders.In theory, these two groups complemented each other, attending to people’s spiritual and temporal needs, respectively. In practice, the two institutions were constantly sparring, disagreeing, or openly warring with each other.
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