Malcolm Byrne (Fianna Fail) | Oireachtas source

The last county to become a county in Ireland was Wicklow in 1606. The reason was that the British were trying to design it as a shire but three families, the O'Tooles, the O'Kavanaghs and the O'Byrnes all rebelled to delay the process. Therefore, if we are to design it around the original county boundaries it should perhaps be around the O’Byrne lands which stretched from Wicklow into Wexford and part of Carlow.