Emmett O'Byrne, War, politics and the Irish of Leinster, 1156–1606, Four Courts Press, 2003, ISBN 1-85182-690-4.
«Leinster from the death of Toirdhealbhach O’Connor in 1156 to the establishment, in 1606, of County Wicklow – the last Irish and Leinster county to be created»