Lucinda Armstrong was my great-great -grandmother. She was born in 1830 at Carrickmgrath, County Donegal to Olipher or Oliver Armstrong,
She married my great-great-grandfather, William Knox ion 18 November 1856 at Donaghmore Church, near Stranorlar in County Donegal.
I've been unable to find out much more about her, other than she outlived her farmer husband and continued to farm the land in Drumawark, Pettigo alone.
The picture is of the church where they married in Donaghmore. I visited in 2017.
See also the Knox page.