Columbia subject headings:
Harvard subject headings:
Assassins--Netherlands--Biography.
Catholics--Netherlands--Biography.
Gerards, Balthazar, approximately 1557-1584.
William I, Prince of Orange, 1533-1584--Assassination.
Princeton subject headings:
Assassins--Netherlands--Biography.
Catholics--Netherlands--Biography.
Gerards, Balthazar, approximately 1557-1584.
William I, Prince of Orange, 1533-1584--Assassination.