Sue,
There were a handful of Martin families recorded as tenants on the Ker Estate, it would be worth your while to have a very careful read of the following journals on that subject. The McGraw's are cited as holding the "late" Serjeant Martin's farm at Lisnagore and other references of the same McGraw family at Corlougharoe. Please note that there is no reference made to Serjeant Martin's first name. The journals are available through the Clogher Historical Society (Membership) or JSTOR (available through some Libraries for free where a reader’s ticket is held, else fee).
The Ker Estate, Newbliss, Co. Monaghan, 1790-c.1830
Theo McMahon and Brendan O Neill
Clogher Record
Vol. 12, No. 1 (1985), pp. 110-126 (17 pages)
Published by: Clogher Historical Society
The Ker Estate, Newbliss
Clogher Record
Vol. 12, No. 3 (1987), p. 394 (1 page)
Published by: Clogher Historical Society
The Parish of Killeevan
Rev. J. Gilsenan
Clogher Record
Vol. 4, No. 1/2 (1960/1961), pp. 16-28 (13 pages)
Published by: Clogher Historical Society
The 18th and 19th Century Graveyard Monuments of Killeevan, Co. Monaghan and Galloon, Co. Fermanagh
Harold Mytum and Robert Evans
Clogher Record
Vol. 18, No. 1 (2003), pp. 1-31 (35 pages)
Published by: Clogher Historical SocietyClogher Historical Society
Corlougharoe Townland:
https://www.townlands.ie/monaghan/dartree/killeevan/drum/corlougharoe/
Lisnagore Townland:
https://www.townlands.ie/monaghan/dartree/killeevan/newbliss/lisnagore/
Tithe Applotment Books - Lisnagore 1825
http://titheapplotmentbooks.nationalarchives.ie/search/tab/results.jsp?…
Newbliss Townland:
https://www.townlands.ie/monaghan/dartree/killeevan/newbliss/newbliss/
Tithe Applotment Books - Newbliss 1825
http://titheapplotmentbooks.nationalarchives.ie/search/tab/results.jsp?…
Newbliss House:
https://archiseek.com/2014/1814-newbliss-house-newbliss-co-monaghan/
Ker Family of Newbliss:
https://discovery.nationalarchives.gov.uk/details/c/F16561
Gravestone transcripts:
https://www.johngrenham.com/records/county_graveyards.php?search_type=f…
McGaw:
https://www.johngrenham.com/findasurname.php?surname=mcgaw
If you would care to post a little more information about Mary Batey such as when she married and to whom, that would be helpful in trying to locate her.
With every good wish,
Maggie McKenna, Carrickmacross.