"Pope Urban I (Latin: Urbanus I) was Bishop of Rome or Pope from 222 to 23 May 230. He was born in Rome and succeeded Pope ...
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Callixtus I, who had been martyred. It was previously believed for centuries that Urban I was also martyred. However, recent historical discoveries now lead scholars to believe that he died of natural causes." - (en.wikipedia.org 12.11.2019)