The nine papers which make up these proceedings range in length from ten to thirty-three pages, and are equally varied in style and subject matter. Three are densely-written studies of particular authors: Augustine (Lewis Ayres), Diadochus of Photike (J. E. Rutherford) and Maximus the Confessor (Nicholas Madden). They explore different but complementary aspects of the relationship between the Trinity and deification, restoration of likeness to God, or the properly ordered working of the human mind. All three, to varying degrees, fail to state their arguments as clearly as they might, but all repay patient reading. Another three papers, though written with particular emphases, are broader surveys: of the parallel development of patristic teaching on the persons of the Trinity and the person of Christ (Brian E. Daley), of the Trinity in early Irish Christian writings (Thomas Finan) and of Trinitarian elements in Latin patristic ecclesiology (Finbarr Clancy) – the last, as well as being a useful collection of texts, with an interesting focus on patristic influence on the Trinitarian ecclesiology of Yves Congar. This leaves three papers: on John Philoponus' philosophical defence of the tritheism embraced by some sixth-century anti-Chalcedonians (U. M. Lang), on the relationship between Trinitarian faith and attitudes to political authority, revisiting Erik Peterson's famous ‘Monotheismus als politisches Problem’ (Vincent Twomey) and on patristic Trinitarianism in modern Catholic theology (Aidan Nichols) – a paper which in ten pages manages to convey much good sense about the filioque, the relationship between essentialism and personalism, the alleged western neglect of the Holy Spirit and other debated questions, even if some of them now seem less pressing than they did during the heyday of anti-Augustinianism among systematic theologians in the 1990s.