Eustace, who was probably born about 1140, and was the first of four successive Lords of Watford, in Northamptonshire, bearing the same name of Eustace, ... seems almost indisputably to have been the Eustachius de Arderne who granted Watford Church to the Abbey of St. James, at Northampton (Bridges, i, 501, from the Register); which grant was followed by donations to Sulby Abbey by Eustace, son of Eustace de Watford. (Ibid. i, 557; and Mon. Ang. vi. 904, from Pat. 9, Edw.II.)