I now have a new problem and local knowledge may be able to solve it.
My elusive ancestor, Mark Halpen is mentioned in a deed.
Mark Halpen, gent of Ballynamona (sic)- (no date or year)
"A confirmed to B the tenement of GROUSIC, in the town of Maryborough"
This is from the Registry of Deeds, and has been transcribed by volunteers.
Any suggestions as to what the correct name is would be greatly appreciated.
Ken Cooke