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184th Roman Pontiff
Bl. Gregory X
GREGORIVS Decimus
Teobaldo Visconti
184th Successor of St Peter · 1271–1276 · Italy · b. Free Commune of Piacenza (city-state)
1271
Elected
1276
Reign ended
5 years
Length
13th
Century
The Life
Citizen of the Free Commune of Piacenza. Convened the Second Council of Lyon and issued the bull Ubi periculum (1274), regulating conclaves until the 20th century.
Portrait: Eccekevin (talk) / Wikimedia Commons