Couldn't locate Ladychapel or Tiermohan in place names in the Griffith Valuation.
Derrinstown, a townland in the Parish of Taghadoe, Poor Law Union of Celbridge
There are quite a few Grogan's listed. There are some
birth records available on a website www.rootsireland.ie
a pay website but a not for profit foundation.
CofI Celbridge, Kildrought records from 1777-1836 no marriages
Celbridge RC 1857-1881 appear to be available notes no marriages as they were not able to microfilm them and suggest contact Parish.
Maynooth births from 1814-1899 deaths 1806-1899
I used to be a member of a UK company of which you must be a member-expensive but might be worth it to you. They have Gravestone Inscriptions to 1900.
Lady Chapel is mentioned, as a cemetary
I have a CD from years ago with the gravestone inscriptions before this company. It won't play it now on new computers, so the only way would be the membership.