Columbia subject headings:
Harvard subject headings:
Byzantine Empire--History--John V Palaeologus, 1341-1391.
Byzantine Empire--History--Manuel II Palaeologus, 1391-1425.
Istanbul (Turkey)--Buildings, structures, etc.
Istanbul (Turkey)--History.
Monuments--Turkey--Istanbul.
Travel, Medieval.
Travelers--Russia (Federation)
Travelers--Turkey--Istanbul.
Princeton subject headings:
Byzantine Empire--History--John V Palaeologus, 1341-1391.
Byzantine Empire--History--Manuel II Palaeologus, 1391-1425.
Istanbul (Turkey)--History.
Monuments--Turkey--Istanbul.
Travelers--Russia (Federation).
Travelers--Turkey--Istanbul.