could any one advise what parish is tinnahinch located in the seat of the dunnes
You might try: http://www.laois.ie/LeisureandCulture/Libraries/
The ancient O'Dunne territory was represented by the barony of Tinnahinch and is situated now in the parishes of Clonaslee and Rosenallis. Clonaslee is well documented by the Dunnes of Brittas who lived there well into the 1900's. The O'Dunne motto was "Mullach Abu" (The Summit to Victory). If you need any more info let me know.
Martin O'Brien