From a historical point of view the significance of third-century Christian texts is incontestable. This is a fundamentally important era in the formation of Christianity. Reconstruction of the social situation and indeed of the major controversies of the third century depends upon evidence being gleaned from elsewhere, such as material preserved by Eusebius in writing his history in the next century. Recent theology has seen a revival of interest in the Trinity. The notion of God as being in some sense community in relationship has been attractive to those who wish to challenge modern individualism. The pluralism within postmodern theology has produced feminist and liberationist interpretations of the doctrine. For traditional churches the mystery of the Trinity is a fundamental identity-marker; but a widening ecumenism which embraces Pentecostalism cannot avoid the challenge this presents, since the Pentecostal churches are themselves divided over the Trinity.