For many years the agricultural revolution in England was thought to have occurred because of three major changes: the selective breeding of livestock; the removal of common property rights to land; and new systems of cropping, involving turnips and clover. All this was thought to have been due to a group of heroic individuals, who, according to one account, are 'a band of men whose names are, or ought to be, household words with English farmers: Jethro Tull, Lord Townshend, Arthur Young, Bakewell, Coke of Holkham and the Collings.'