Sempiternus Rex Christus
On the Council of Chalcedon
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This catalogue
Sempiternus Rex Christus (1951). On the Council of Chalcedon. docs.church. https://docs.church/sempiternus-rex-christus
Official citation
Pius XII, Sempiternus Rex Christus (8 September 1951). https://www.papalencyclicals.net/pius12/p12sempi.htm