 The 13th century also appears to have been a period of relative prosperity, with many of the monasteries which had been established in the 12th century beginning to flourish; most notably Furness Abbey in the south of the county which went on to become the second richest religious house in the north of England with lands across Cumbria and in Yorkshire.Wool was probably the greatest commercial asset of Cumbria at this time, with sheep being bred on the fells then wool carried along a network of packhorse trails to centres like Kendal, which became wealthy on the wool trade and gave its name to the vibrant Kendal Green colour.Iron was also commercially exploited at this time and the wide expanses of Forest became prime hunting ground for the wealthy.