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
Samuel Birch (Lord Mayor of London) the lord mayor, and on the reverse a representation of a wheatsheaf, with the legend, 'Free Importation, Peace and Plenty.' During his mayoralty the marble statue of George III by Chantrey, the inscription on which was written by Birch, was placed in the council chamber of Guildhall. Almost his last act as lord mayor was to lay the foundation-stone of the London Institution in Finsbury Circus (then called the Amphitheatre, Moorfields) on 4 November 1815. In 1836 Birch, who had for many years carried on his father's old business in Cornhill, disposed of it to Messrs. Ring & Brymer, the