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Pope John XXIII Announces his Intention to Call the 21st Ecumenical Council
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Pope John XXIII outlines preparation phase for the council and its agenda
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Pope John XXIII formally summons the council
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First Session of the Council Convenes (16 Commissions Created)
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The First Session Closes. None of the Originally Drafted Documents Were Approved
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Pope John XXIII Dies
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Pope Paul VI is Elected Pope
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The Second Session of the Council Convenes
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Second Session Closes, 2 Documents Approved