Non Sine Gravissimo – Apostolic Letter of the Supreme Pontiff to Venerable Brother Antonio Giuseppe, Archbishop of Tiene, Our Apostolic Delegate and of this Apostolic See in the City of Constantinople (Pius IX – Feb. 24, 1870)
Non Sine Gravissimo – Apostolic Letter of the Supreme Pontiff to Venerable Brother Antonio Giuseppe, Archbishop of Tiene, Our Apostolic Delegate and of this Apostolic See in the City of Constantinople (Pius IX – Feb. 24, 1870)
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