William Grindecobbe motivated at least in part to rebel as a result of the pressures of papal taxation. Along with Wat Tyler and John Wrawe, he was one of the key leaders of the peasants during the revolt of 1381, leading the townspeople of St Alban's on 15 June. He was executed in 1381 along with John Wrawe and John Ball. His trial and execution was overseen by Henry le Despenser. During the Peasants' Revolt of 1381, he became well known for his actions against the high lord Thomas de la Mare, Abbot of St. Albans. He led a deputation to King
Peasants' Revolt also resented the presence of foreigners, Flemish weavers in particular. Londoners detested John of Gaunt because he was a supporter of the religious reformer John Wycliffe, whom the London public regarded as a heretic. John of Gaunt was also engaged in a feud with the London elite and was rumoured to be planning to replace the elected mayor with a captain, appointed by the Crown. The London elite were themselves fighting out a vicious, internal battle for political power. As a result, in 1381 the ruling classes in London were unstable and divided. Rural communities, particularly in the south-east, were