Eusebius of Caesarea is an elusive ecclesiastical writer: we have Eusebius the panegyrist author of the Life of Constantine; Eusebius the ‘father’ of Ecclesiastical History; the (semi?) Arian (?), the champion of the Nicene homoousion, Eusebius the Saint in some traditions; Eusebius the hagiographer of the Martyrs of Palestine; the biblical exegete; and also Eusebius the evangelist and author of the Eusebian Canon Tables, known also as Apparatus or Pinakes. Jeremiah Coogan’s erudite book focuses on this last aspect of Eusebian output, the so-called Apparatus as a means of (re-)ordering the Fourfold Gospel. The monograph is the author’s revised PhD thesis at the University of Notre Dame and has already received the Manfred Lautenschlaeger Award for Theological Promise 2022. The book reflects the renewed interest in Eusebian Canons and complements the recent scholarly focus on ancient reading and writing technologies, to which two Series are dedicated, ‘Cultures of Reading in the Ancient Mediterranean’ by OUP and ‘Studies in Manuscript Cultures’ by De Gruyter.