Columbia subject headings:
Castles--Ireland--History.
Darby family.
Leap Castle (Ireland)--History.
Harvard subject headings:
Castles--Ireland--History.
Darby family.
Leap Castle (Ireland)--History.
Princeton subject headings:
Castles--Ireland--History.
Castles--Ireland--Social life and customs.
Leap Castle (Ely O'Carroll Country, Ireland)--History.