Debate over the causes and effects of the Battle of Manzikert (1071) has long preoccupied many academics, university students, and people generally interested in Byzantium. Georgios Theotokis opens his book by presenting that debate’s central question: why exactly did a single battle lead to the quick loss of Anatolia, so that Asia Minor, a Roman province since classical antiquity, became the Turkish homeland? He states his answer from the outset: the battle proved geopolitically decisive because it introduced an element of chaos into Byzantine history, especially due to the capture of Romanos IV Diogenes. [...] In sum, this is a highly valuable work [...]. I will certainly be adding it to reading lists in the future, and I encourage other historians to use it as a starting point for further investigation.