This book is a revised version of Deliyannis's 1994 University of Pennsylvania dissertation. In the intervening years the author has published a number of valuable articles and also an English translation of Agnellus (Washington, DC 2004). Agnellus was an angry and chatty Ravennate cleric who composed his episcopal history in stages between the early 830s and shortly after 846. In addition to telling what he could about the history of the bishopric of Ravenna, Agnellus aimed to vindicate the rights of the Ravenna clergy against the local archbishops and to defend Ravenna itself against papal encroachment. He used a wide array of sources (effectively discussed at pp. 22–52) and where he can be checked he seems to have been scrupulous. His often lengthy and detailed descriptions of churches and monuments have long been mined by art historians. The work survives in two incomplete manuscripts: Bibliotheca Estense, Cod. Lat. 371 X.P.4.9, and Vat. Lat. 5834. The former dates from the fifteenth century, lacks two Lives and presents a few others incompletely. It is seriously corrupt in grammar and orthography. The latter dates from the sixteenth century. It breaks off about a third of the way through but presents a better text than Codex Estense. These manuscripts appear to derive from a 1296 copy. The Lives of Peter Chrysologus and Severus survive in several medieval lectionaries and provide some checks on the surviving manuscripts. The work was edited in 1708 by Benedetto Bacchinius whose version, somewhat corrected, was reprinted by L. A. Muratori and then by J.-P. Migne in PL cvi. In 1878 Oswald Holder-Egger published a new edition for the MGH. He improved on earlier versions but did not know the lectionary Lives. In 1924 Alessandro Testa-Rasponi embarked upon a new edition which he did not live to finish. Deliyannis has now given us a diplomatic edition of the Codex Estense with the readings from the Vatican manuscript and the lectionary Lives. The work is expertly accomplished and it is unlikely that we shall get a better text, or one closer to what Agnellus actually wrote.