 Efforts by Jewish Christians to proselytize Jews began in the first century, when Paul the Apostle preached at the synagogues in each city that he visited.However, by the fourth century CE, non-biblical accounts of missions to the Jews do not mention converted Jews playing any leading role in proselytization.Notable converts from Judaism who attempted to convert other Jews are more visible in historical sources beginning around the 13th century, when Jewish convert Pablo Christiani attempted to convert other Jews.