September 1 is one of the feast days of Saint Cuimmen of Drumsnat, he seems to have a second commemoration at September 4. Canon O'Hanlon has this to say of the saint at September 1:
St. Cuimmen, Son of Cuanna, or Cuanach, probably Abbot of Druim-Snechta, now Drumsnat, County of Monaghan.
St. Cuimmen, Son of Cuanna, or Cuanach, probably Abbot of Druim-Snechta, now Drumsnat, County of Monaghan.
To us it seems very probable, that the present holy man was not distinct from a saint bearing the same appellation, and said to have been venerated on the 4th of this month, at Drumsnat, County of Monaghan. The name of Cuimmen, son of Cuana, or Cuanach, occurs in the Martyrologies of Tallagh, of Marianus O'Gorman, and of Donegal, at the 1st of September.