Columbia subject headings:
Louis I, Emperor, 778-840.
Theganus, Archbishop of Trier. Gesta Hludowici imperatoris.
Harvard subject headings:
Charlemagne, Emperor, 742-814--Succession.
France--History--To 987.
Franks--History--814-843--Sources.
Holy Roman Empire--History--To 1517.
Louis I, Emperor, 778-840.
Thegan, Chorepiscopus of Trier, approximately 800- Gesta Hludowici imperatoris.
Princeton subject headings:
Gesta Hludowici imperatoris.
Louis I, Emperor, 778-840.
Thegan, Chorepiscopus of Trier, approximately 800-