Depending on the measure used, £10,401 in 1588 could equate to either £2,040,000 (using the retail price index) or £23,300,000 (using the average earnings index). For comparison, £10,401 was almost five times the income of a wealthy knight of the period such as like William Darrell, who owned 25 manors and enjoyed an annual income of around £2000.[94] ↑ See Sharpe, 1825 for the 25th edition of the original guidebook.