History II / Christianity, the Church and Spirituality, East and West
Practice question · Numerical answer

In which year did papal legates and the patriarch Michael Keroularios excommunicate one another in Constantinople?

Hints
  1. It falls in the middle of the eleventh century, two decades before the Investiture Contest.
  2. Ten fifty-four.
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1054

Why

1054: and the excommunications were annulled by Paul VI and Athenagoras in 1965. The nine hundred years in between are why the date is remembered; the fact that annulling them changed nothing structural is why historians distrust it as the moment of separation.

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