Balrath civil parish doesn't exist in reality.

Balrath townland: https://www.logainm.ie/38675.aspx should be part of Piercetown civil parish: https://www.logainm.ie/1910.aspx

https://www.openstreetmap.org/relation/4648837
https://www.openstreetmap.org/relation/5205737
https://www.openstreetmap.org/relation/5195333