In June 1483, the Duke of Gloucester came to the throne as King Richard III. Soon afterwards, Collingbourne positioned himself in opposition of the new King. In October, he was most probably involved in the Duke of Buckingham's revolt in favour of Henry Tudor. Both Walter Hungerford and John Cheyne, who had served with Collingbourne on the commissions of 1478 and April 1483, were among the leaders of the revolt.