Query: 9th-century history books
Relevant documents:
Historia Brittonum
Royal Frankish Annals
Chronica Prophetica
Historia Langobardorum codicis Gothani
Nihon Kōki
Shoku Nihon Kōki
Nihon Montoku Tennō Jitsuroku
Conversion of Kartli (chronicle)
Futuh al-Buldan