Columbia subject headings:
Africa--Discovery and exploration--Portuguese.
Ethiopia--History.
Portugal--History--Period of discoveries, 1385-1580.
Harvard subject headings:
Africa--Discovery and exploration--Portuguese
Ethiopia--History
Portugal--History--Period of discoveries, 1385-1580
Prester John (Legendary character)
Princeton subject headings:
Africa--Discovery and exploration--Portuguese.
Ethiopia--History.
Portugal--History--Period of discoveries, 1385-1580.