Byzantine style and civilization. Harmondsworth, 1975
The Byzantine theocracy. Cambridge, 1977
The Eastern Schism: a study of the papacy and the Eastern churches during the XIth and XIIth centuries. Oxford, 1955
The Emperor Romanus Lecapenus and his reign: a study of tenth-century Byzantium. London, 1929
The fall of Constantinople 1453. Cambridge, 1965
The families of Outremer: the feudal nobility of the crusader kingdom of Jerusalem, 1099-1291. London, 1960
The first crusade. Cambridge, 1951
The Great Church in captivity: a study of the patriarchate of Constantinople from the eve of the Turkish conquest to the Greek War of Independence. London, 1968
A history of the crusades. Cambridge, 1951-1954
A history of the first Bulgarian empire. London, 1930
The last Byzantine renaissance. Cambridge, 1970
The medieval Manichee: a study of the Christian dualist heresy. Cambridge, 1947
The Orthodox churches and the secular state. Auckland, 1971
The Sicilian Vespers: a history of the Mediterranean world in the later thirteenth century. Cambridge, 1958
The white rajahs: a history of Sarawak from 1841 to 1946. Cambridge, 1960