The formal exclusion of a person from participation in the sacraments and services of the Christian Church as a penalty for serious offenses. This punishment effectively cut individuals off from the religious community and, in medieval times, often from society itself.
From Latin 'excommunicatio,' meaning 'to put out of the community.' The term combines 'ex-' (out of) and 'communicare' (to share), originally referring to being cut off from communion with the Church.
Excommunication was the medieval Church's nuclear option! When Emperor Henry IV was excommunicated by Pope Gregory VII in 1076, he literally had to stand barefoot in the snow for three days at Canossa to beg forgiveness, showing how this spiritual weapon could topple even the mightiest rulers.
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