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 London, killing the Lord Chancellor and the Lord High Treasurer, whom they found inside. On 15 June, Richard left the city to meet Tyler and the rebels at Smithfield. Violence broke out, and Richard's party killed Tyler. Richard defused the tense situation long enough for London's mayor, William Walworth, to gather a militia from the city and disperse the rebel forces. Richard immediately began to re-establish order in London and rescinded his previous grants to the rebels. The revolt had also spread into East Anglia, where the University of Cambridge was attacked and many royal officials were killed. Unrest continued