 This placed her at the hub of a powerful structure of landed country gentry, who acted as her advisers and officers; Joan in turn acted as "arbitrator, feoffee in property transactions, and intercessor with the royal government".During the Peasants' Revolt in 1381, some of Joan's manors were sacked by the rebels; this did not deter Joan from expanding and industrialising her lands after the uprising had been put down, having done much to encourage the dyeing and fulling of woollen cloth on some of her estates such as Saffron Walden.In the Public Record Office, London, there is an extant document, written in Latin, which records the payment to Joan by John of Gaunt for the maintenance of her younger daughter Mary after the latter's marriage until she came of age in 1384.