
John was a Roman, son of Projectus, and a priest of the basilica of San Clemente, where carved marble still bears his name. He was elected after a vacancy of over two months marked by simony.
He seems to have been the first pope to take a new name on election; he had been known as Mercurius. During his reign the decree against buying votes in papal elections was confirmed and set up in St Peter's. He kept good relations with both the Gothic king Athalaric and the Emperor Justinian.
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