In April 1534, Henry confirmed Cromwell as his principal secretary and chief minister, a position which he had held for some time in all but name. Cromwell immediately took steps to enforce the legislation just passed by Parliament. Before the members of both houses returned home on 30 March, they were required to swear an oath accepting the Act of Succession, and all the King's subjects were now required to swear to the legitimacy of the marriage and, by implication, to accept the King's new powers and the break from Rome. On 13 April, the London clergy accepted the oath. On the same day, the commissioners offered it to Sir Thomas More and John Fisher, Bishop of Rochester, both of whom refused it. More was taken into custody on the same day and was moved to the Tower of London on 17 April. Fisher joined him there four days later. On 7 May Cromwell led a deputation from the commissioners to Fisher and More, to persuade them to accept the Act and save themselves. This failed and, within a month, both prisoners were executed.