In early Christianity miracles were the most often attested motivations for conversions of pagans; pagan Romans took the existence of miracles for granted; Christian texts reporting them offered miracles as divine proof of the Christian God's unique claim to authority, relegating all other gods to the lower status of "daimones": "of all worships, the Christian best and most particularly advertised its miracles by driving out of spirits and laying on of hands". The Gospel of John is structured around miraculous "signs": The success of the Apostles according to the church historian Eusebius of Caesarea lay in their miracles: "though laymen in their language", he asserted, "they drew courage from divine, miraculous powers". The conversion of Constantine by a miraculous sign in heaven is a prominent fourth-century example.