Title: Die Taten Kaiser Ludwigs (Monumenta Germaniae historica)
Subjects: Louis I, Emperor, 778-840., Thegan, Chorepiscopus of Trier, b. ca. 800., Astronomus, fl. 814-840., France -- History -- To 987 -- Sources., Germany -- History -- To 843 -- Sources., France -- Kings and rulers -- Biography., Germany -- Kings and rulers -- Biography.