Cornelius Grogan

Cornelius Grogan (1738?–1798), was a United Irishman and commissary-general in the insurgent army of Wexford in the Rebellion of 1798.

On the outbreak of the Irish rebellion of 1798, Grogan joined the insurgents (whether willingly or under compulsion was later the crucial issue at his trial), and became commissary-general in their army.

Two other landlords of Wexford who had taken the same action as himself, John Henry Colclough and Bagenal Beauchamp Harvey, suffered with him, as well as other rebel leaders.

His estates were escheated by the Crown, but were restored on the payment of a heavy fine to his youngest and only surviving brother, John Knox.

Another brother, Thomas, a lieutenant in the British army, was killed at the battle of Arklow on 9 June 1798.