The Christian Perspective on peace and justice broadly divides into two responses. The first links peace and justice and requires the witness to pacifism as part of the witness to justice. this position was grounded in the ministry of Jesus Christ and shaped the early Church for the first 300 years. The second response insists that for the sake of justice and peace, it is sometimes necessary to fight. This is position that arose after the conversion of the Roman Emperor Constantine in about 340 CE. I shall now examine each position in more detail.