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Transubstantiation is made official Catholic doctrine.

Date: 1215

The Story of: The Colonizer Wound, Blood
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Transubstantiation is the belief that the body and blood of Christ are transformed into the holy Eucharist. While differing in intensity and practice across different Christian sects, this practice has existed from the early days of Christendom, but this is the first time that it becomes official doctrine.