Seems that our family did in fact originate in Ireland. I was wandering through the internet today and came across these photos. 

Ardtully and the old Orpen estate

The pics are of an estate (castle) called Ardtully, in southern Ireland. I gather it was quite the promenant fixture in the landscape, until Cromwells army invaded and razed the place to the ground. I remember your great-grandfather Orpen talking about Ardtully years ago, back when I was much younger than you are now. 

Too bad, ... it looks like it might have been a real nice place to live back in the dark ages. The ORPEN family coat of arms still hangs over the main entrance though, which is a plus. 

I'll have to go there some day, if for nothing more than to just see it with my own eyes. 

The castle was a permanent fixture in the surrounding landscape until Cromwells army razed it to the ground It still lives on, although not as prominent as before
The ORPEN Coat of Arms still hangs over the main entrance