Ermington was originally part of the Field of Mars area. In February 1792, Governor Arthur Phillip granted parcels of land on the northern bank of Parramatta River in the Field of Mars to eight marines: Isaac Archer, John Carver, John Colthread, Thomas Cottrell, James Manning, Alexander McDonald, Thomas Swinnerton and Thomas Tining. Most of the parcels were about in size, except for McDonald's which was 130 acres (apparently because he was married). The settlers used their land to grow wheat, maize and vegetables.