Hi, I think I may have some good news for you
I was today in the RCB Library in Dublin, where many of the original Anglican Church records that survive today are kept. Only a small fraction of these records are online, so for most records it involves asking for a register for a specific parish, and turning the pages very gently.
The good news is that the Birth records for Oldcastle parish in County Meath are there. And on page 21 entry number 126 is
" (Birth) Thomas, son of Thomas and Jane Lyndsay of this parish, born 20th April 1821".
The family had further birth entries as follows
Jane born 1816
Mary born 1819
James born 1824
John born 1826
Robert born 1829
However there is an entry in the Burials section
Jane Lyndsay aged 40 died April 1832
One cannot take photos of the registers, but the Library Staff are happy to handle a request from you for Digital copies, which they will charge ten euros per copy item. Their website is
www.libraryireland.anglican.org and you can email them at
library@ireland.anglican.orgThere are some other Lyndsay names in the book who may or may not be related to them. I am under some time pressure now but if you are interested I will give them in another post in a few days
Hope this helps your search
Kevin (meath999)