Marmion is a surname found in France, Great Britain and Ireland, of Norman-French origin.
[1] They retained their lands at Fontenay-le-Marmion in Normandy, but William's son Roger (died c. 1075) went to England.
The progenitor was Sir Robert Marmion of 'Fidun' where he built a castle (modern Fathom, County Armagh – a strategic defensive area for the Norman-Irish).
He is documented in lists of Strongbow's companions and also in a 'prest' of knights held by King John in Dublin in 1210.
The Marmions later gave up living at Fidun due to frontier pressures and removed to close-by Carlingford where they were important burgesses and leaders for centuries, until the then Chief-of-Name Marmion forfeited all his lands as an 'Irish Papist' to the Cromwellian invaders, circa 1655.