of Zebedee in Acts 12:1–2, and knowledge that both John and James, son of Zebedee, ended up martyred, appears to be reflected in Mark 10:39. Judith Perkins has written that many ancient Christians believed that "to be a Christian was to suffer," partly inspired by the example of Jesus. The lives of the martyrs became a source of inspiration for some Christians, and their relics were honored. Numerous crypts and chapels in the Roman catacombs bear witness to the early veneration for those champions of freedom of conscience. Special commemoration services, at which the holy Sacrifice were offered over their tombs gave rise to the time honoured custom of consecrating altars by enclosing in them the relics of martyrs. The Roman Empire In its first three centuries, the Christian church endured periods of persecution at the hands of Roman authorities. Christians were persecuted by local authorities on an intermittent and ad hoc basis. In addition, there were several periods of empire-wide persecution which were directed from the seat of government in Rome. Christians were the targets of persecution because they refused to worship the Roman gods or to pay homage to the emperor as divine. In the Roman Empire, refusing to sacrifice to the Emperor or the empire's gods was tantamount to refusing to swear an oath of allegiance to one's country. However, some scholars, such as Morton Smith, point out that other sects, such as the Jews and Samaritans, also refused to worship other gods, but were not generally persecuted. Smith points out that the early Christians (in the 100's to the 200's) were accused of practicing magic and other crimes associated with magic, and that magic has been commonly neglected in discussions of the persecutions. Jacob Burkhardt writes that the reason for the persecution of Christians under Diocletian around 300 may have been that after a period of growth and expansion Christians sought to gain control of the imperial office. The cult of the saints was significant to the process of Christianization, but during the first centuries of the Church the celebrations venerating the saints took place in hiding. Michael Gaddis writes that "[t]he Christian experience of violence during the pagan persecutions shaped the ideologies and practices that drove further religious conflicts over the course of the fourth and fifth centuries". Martyrdom was a formative experience and influenced how Christians justified or condemned the use of violence in