Columbia subject headings:
Essex, Robert Devereux, Earl of, 1565-1601.
Great Britain--History--Elizabeth, 1558-1603.
Harvard subject headings:
Essex, Robert Devereux, Earl of, 1565-1601
Essex, Robert Devereux, Earl of, 1566-1601.
Great Britain--History--Elizabeth, 1558-1603.
Princeton subject headings:
Essex, Robert Devereux, Earl of, 1565-1601.
Great Britain--History--Elizabeth, 1558-1603.