On the 1st of February 1921: The first execution under martial law of an IRA man took place.
Cornelius Murphy of Ballydaly, Millstreet, was shot by firing squad at the Cork Military Barracks (which is now on the grounds of UCC), after he had been arrested on January 3rd at his parents house in Ballydaly, tried by court martial and found guilty of having a revolver in his possession.
The plaque (right) at UCC commemorates those executed and buried there in 1921.
Read much more about Captain Con Murphy in this old article.
Thank you for posting. A humbling reminder.