John Lynch (pseudonym: Gratianus Lucius; c. 1599 – c. 1677) was an Irish Roman Catholic priest, known as a historian and Archdeacon of Tuam.
He was born into a Hiberno-Norman family at Galway, probably in 1599; according to tradition his father was Alexander Lynch, a schoolmaster. He was educated by the Jesuits, and became a secular priest about 1622. He celebrated Mass in secret, and in private houses; and kept a school.[1]
He was appointed archdeacon of Tuam, and lived in the old castle of Ruaidrí Ua Conchobair. He was a friend of Dubhaltach Mac Fhirbhisigh. On the surrender of Galway to the New Model Army in 1652 he left for France; some of his works were printed at St. Malo. Lynch died in France.[1]
He was the author of: