Agnes was born about 1695, the daughter of unknown parents. The place is not known.
Her husband was John Izat, who she married on 21 NOV 1718 in Clackmannan, Clackmannanshire, Scotland. Their five known children were Robert (c1720-?), James (c1726-?), John (c1729-?), Janet (c1731-?) and Agnes (c1738-?).