 In 1275 a tithe of real income was assessed on all religious houses to fund a crusade, at which time Inchaffray had an income of 246 pounds per annum, fourth among Augustinian houses, exceeded only by St Andrews, Scone and Holyrood.In time the abbey's lands and dependent churches stretched across Scotland, as far away as Uist in the west and Balfron in the south.The abbey ordered the digging of the Pow of Inchaffray, a nine-mile drainage ditch, to improve nearby marshland.