Part of the larger enterprise of the Prosopography of the Byzantine World project, and based on a British Academy colloquium in 2002, the fourteen articles contained in this book make clear the extraordinary range of sources available for the eastern Mediterranean world in the eleventh and twelfth centuries, and the need for scholarly attention to turn towards non-Greek sources for the period. According to the introductory essay by Michael Jeffreys, ‘participants in the colloquium were asked to assess the importance for the Byzantine and crusader world of the particular sources they were invited to discuss’. Each contributor approached their topics, generally distinguished by language and sometimes also by geography, with a common template that included a brief discussion of the sources as well as an annotated bibliography, a structure which nevertheless allowed for considerable variability of scope among the articles. Jonathan Riley-Smith discussed ‘Pilgrims and crusaders in western Latin sources’, Peter Edbury covered ‘Crusader sources from the Near East (1099–1204)’, Michel Balard explored the sources of Genoa, Venice, Pisa and Barcelona, Michael Angold focused on Venetian chronicles and archives, while Vera von Falkenhausen discussed South Italian sources, and Krijnie Ciggaar described ‘Visitors from northwestern Europe to Byzantium’. Covering the non-Latin world is Simon Franklin on ‘Slavonic sources’, Stephen H. Rapp, Jr, on ‘Georgian sources’, Tim Greenwood on ‘Armenian sources’, Witold Witakowski on ‘Syriac historiographical sources’, Carole Hillenbrand on ‘Sources in Arabic’, Jeremy Johns on ‘Arabic sources for Sicily’ and Nicholas de Lange on ‘Jewish sources’, with a bibliography by Joshua Holo. In addition to providing useful discussion of sources, some articles also provide engaging discussion of the scope and challenges of the project. Vera von Falkenhausen, in her chapter on the South Italian sources, queries the ambitious scope of the project, covering the territories that belonged to Byzantium at the end of the reign of Basil ii (1025) in the period 1025 to 1204, when many lands, including southern Italy, fell out of Byzantine possession. The connection between a Norman living in Taranto in 1200 and Byzantium might be slight indeed. The most helpful chapters achieve a number of goals in just a few pages: providing a helpful bibliography for texts and traditions which have been largely discussed in lesser-known languages or published in obscure places, giving a critical appraisal of both editions and translations of important sources, and appraising the prosopographical utility of the sources discussed. The book also includes an introductory essay by Michael Jeffreys, outlining the scope of the larger project, as well as ten small but good maps. It is surprising to find that six of the thirteen chapters are devoted to western, and largely Latin, topics, a focus which in some ways goes against the stated aims of the project. Nevertheless, the book is useful to anyone studying the Mediterranean in this period, and should be the first point of reference for anyone using non-Greek sources.