Reviewed by: Clavis patrum Graecorum, Volumen IV: Concilia, Catenaeed. by Maurice Geerard and Jacques Noret Scott G. Bruce Clavis patrum Graecorum, Volumen IV: Concilia, CatenaeM auriceG eerardand J acquesN oret( eds.) Turnhout: Brepols, 2018. 2nded. Pp. xxx + 430. ISBN: 978-2-503-57963-4 Begun in 1974 and encompassing six volumes, the series Clavis Patrum Graecorum [End Page 558]( CPG) aims to provide an authoritative inventory of every known work written by Greek patristic authors with evaluations of their authenticity and their state of survival (most are still extant, but some are only known from references in other works). Like the Bollandist enterprise Bibliotheca Hagiographica Graecaand its Latin counterpart, each work in the CPGreceives an inventory number, which scholars can use as a convenient shorthand for the work in question. Each entry also features a bibliography and useful but laconic notes about the survival of these texts in other languages, including Latin, Syriac, Armenian, Georgian, Arabic, and more. The first volume of the series treats the writings of the Ante-Nicene Greek fathers, while the second and third volumes cover authors from the fourth to the eighth centuries, from Athanasius of Alexandria to John of Damascus. The fourth volume is perhaps the most obscure and least utilized of the series. It is devoted to the canons of the early Greek church councils and Greek catenae, literally "chains" of patristic commentary on biblical texts. The first edition of CGP4 appeared in 1980. The publication of a second edition nearly four decades later (the volume under review) is a testimony to recent industry in this specialized field of research in Greek patristic works and their reception. A side-by-side comparison of the first and second editions of CGP4 provides a clear indication of the advances to research made in the thirty-seven years separating the two volumes. Entries on church councils from the Synod of Ancyra (ca. 314) to the Quinisext Council or Council in Trullo (692) and related texts (like the lists of the names of the bishops who attended certain councils) still comprise over half of the book (1–239), but they have all been amplified in light of new scholarship. Most noteworthy here is the incorporation of references to the three volumes of the second series of Acta Conciliorum Oecumenicorum, which began publication in 1984, but work on the transmission of these conciliar acts in translations and paraphrases of languages other than Greek has proceeded apace. The slightly shorter section concerning Greek commentaries on books of the Old and New Testaments (241–399) has been substantially updated, primarily in the wake of the ongoing industry of a number of scholars laboring fruitfully in this field: Françoise Petit on the Octateuch; Gilles Dorival on the psalms; U. and D. Hagedorn on the book of Job; and A. Labate, J.-M. Auwers and R. Ceulemans on the Books of Kings. The work accomplished in this area of research in the past thirty years has been "beaucoup plus féconds," as the editor notes (viii), but "même s'il reste énormément à faire." One of the major concessions evident in the second edition of the CPGis the editor's decision to present the volume's introduction and discursive commentary in French rather than in Latin, this owing to the precipitous and lamentable decline in the knowledge of Latin among contemporary scholars. This new edition of the fourth volume of CPGdeserves attention as a well-grounded and meticulously researched instrument of reference for the study of Greek church councils and patristic exegetical catenaeand their reception. Two new indices cross-reference the contents of this volume with those of the first three volumes of the CPGand provide a list of the patristic authorities whose names appear in the exegetical catenae. As the contents of this book admirably demonstrate, these expressions of Christian [End Page 559]doctrine had a wide and tenacious influence not only in the Greek world, but also in the far-flung Christendoms of western Europe, the Muslim caliphates, Ethiopia, and the Slavic lands. Despite the obvious advances witnessed over the past few decades, the...