the Wise, emperor of the Byzantines 886-912, broke with three centuries of tradition. He was not a general or even a soldier, as his predecessors had been, but a scholar-a second son who became heir apparent through the untimely death of his older brother on the battlefi eld and gained a throne taken by his father Basil I (r. 867-86) after murdering Michael III (r. 842-67). It was the religious education he gained under the tutelage of the famous and infl uential Photios (patriarch from 858-67 and 877-86 ce) that was to distinguish Leo VI as an unusual ruler. Th e argument of this book is that Leo's Christian Orthodox worldview coloured every decision he made; the impact of his religious faith, traced through his extensive literary output, transformed Byzantine cultural identity and infl uenced his successors, establishing the Macedonian dynasty as a 'golden age' in Byzantium until the early eleventh century. Leo's father, Basil I , also known as Basil the Macedonian, was forcibly married in 865 to Eudokia Ingerina , the mistress of the emperor Michael III (r. 842-67). Th us upon Leo's birth in September of 866, his parentage was cast under suspicion, a problem that his older brother Constantine , the son of Basil 's fi rst wife Maria and the original heir to the throne , did not have. 1 Contemporary chronicles record that Leo was likely the son of Michael, but modern scholars are divided. Either way, the truth cannot be known. Th e fact that Leo was born under a cloud of uncertainty is the relevant point, because it meant that this unexpected emperor had to contend with issues of legitimacy , yet was unable to rely upon the tradition of imperial strength through military service. Th e only possibility available to him was the power of religion, and he used it brilliantly to reinforce his authority over the Byzantine oikoumene .