For those living in the East Roman Empire, it was God-protected, immune from the impermanence of other states. But in late Byzantium, intellectuals began to reconsider this assumption: could the East Roman Empire be vulnerable, even temporary? And what would that mean for the Orthodox Church? Through his engagement with influential intellectuals at the time, principally Philotheos Kokkinos, Demetrios Kydones, Cardinals Bessarion and Isidore, George...