It is said that after Whitsunday, 20 May 1374, the prince presided at a council of prelates and nobles held at Westminster to answer a demand from Pope Gregory XI for a subsidy to help him against the Florentines. The bishops, after hearing the pope's letter, which asserted his right as lord spiritual, and, by the grant of John, lord in chief, of the kingdom, declared that "he was lord of all". The cause of the crown, however, was vigorously maintained, and the prince, provoked at the hesitation of Archbishop Wittlesey, spoke sharply to him, and at last told him that he was an ass. The bishops gave way, and it was declared that John had no power to bring the realm into subjection.