Ffrench was a descendant of The Tribes of Galway, though by the 18th century his family had become Protestant.
[1][2] In 1794 Ffrench was accepted as a Dominican postulant in The Claddagh priory of Galway.
Nicholas's parish chapel', later the Pro-Cathedral, on Middle and Lower Abbeygate Streets.
Ffrench retired to Thornville, Kinvara, building some nine churches, and aiding in school education.
Towards the end of his life he lived near his sister, Mrs. Blake-Forster, at Park Lodge, Gort.