The early medieval societies of Byzantium and western Europe that emerged from the late Roman world shared more than a few institutions, traditions and religious experiences. They sometimes rubbed shoulders in ways we overlook. Rome’s clerical elite was so hellenised that the pope who reigned at Charlemagne’s birth spoke Greek as his mother tongue. Under Charlemagne’s grandsons, members of the Byzantine missionary Methodios’ entourage wrote Greek majuscules in the memorial book of a German monastery to record their stay; Methodios was himself a native of Thessaloniki, formerly a Byzantine imperial official in Macedonia and a monk in Bithynia (see above, p. 300). Conversely, Franks served in the Byzantine emperor’s military household and figured at palace banquets.