Columbia subject headings:
Chaucer, Geoffrey, -1400.
John, of Gaunt, Duke of Lancaster, 1340-1399.
Harvard subject headings:
Chaucer, Geoffrey, -1400
John, of Gaunt, Duke of Lancaster, 1340-1399.
Princeton subject headings:
Chaucer, Geoffrey, -1400.
John, of Gaunt, Duke of Lancaster, 1340-1399.