Columbia subject headings:
Harvard subject headings:
Charlemagne, Emperor, 742-814--Romances.
Chivalry--Juvenile literature.
Legends--France--Juvenile literature.
Pepin, King of the Franks, -768--Juvenile fiction.
Twins--Juvenile literature.
Princeton subject headings:
Charlemagne, Emperor, 742-814--Romances.
Fiction.