The Translation of the above inscription is:

"Father Peadar Ó Néill, s.p. (sagart paróiste - priest of parish / parish priest) of Sean-Gharra and Baile Mhic Óda (these are the placenames in Irish: Shanagarry and Ballymacoda) who built this chapel in 1814 (and) who was exiled in Australia 1800-1803."