A martyr is a person who is put to death or endures suffering for their beliefs, principles or ideology. The death of a martyr or the value attributed to it is called martyrdom. In different belief systems, the criteria for being considered a martyr are different. In the Christian context, a martyr is an innocent person who, without seeking death, is murdered or put to death for his or her religious faith or convictions. An example is the persecution of early Christians in the Roman Empire. Christian martyrs sometimes decline to defend themselves at all, in what they see as an imitation of Jesus' willing sacrifice.