This site has photographs of many gravestones in St. John's Church of Ireland Graveyard, Coolbanagher. It includes a number of Holmes. Most are recent but I believe "Holmes 1" to be someone in our line. I'll check this out and substantiate.
Laois or Queen's Co., Ireland Genealogy: St. John's Church of Ireland, Coolbanagher, Co. Laois, Ireland. Graveyard Photographs, ©Jane Lyons