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 up its royal privileges. Revolt then spread north from Cambridge toward Ely, where the gaol was opened and the local Justice of the Peace executed. In Norfolk, the revolt was led by Geoffrey Litster, a weaver, and Sir Roger Bacon, a local lord with ties to the Suffolk rebels. Litster began sending out messengers across the county in a call to arms on 14 June, and isolated outbreaks of violence occurred. The rebels assembled on 17 June outside Norwich and killed Sir Robert Salle, who was in charge of the city defences and had attempted to negotiate a settlement. The