She was reputed to be one of the witnesses at the secret wedding ceremony of the King and Anne Boleyn which occurred on 25 January 1533.
In 1516 Sir John and his henchmen killed a local magistrate and Thomas Wolsey took the opportunity to send both Anne's brother and her father to the Tower.
[2] This was on 25 January 1533, and was conducted in secrecy as Anne Boleyn was pregnant and Henry had not yet annulled his marriage to Catherine of Aragon.
Brereton was then a groom of the Privy Chamber and one of the other guests at the secret royal wedding, along with Thomas Heneage and Henry Norris.
In a letter to Cromwell dated 1 May 1535, Anne, then Dowager Baroness Berkeley: Complains of the delay of the master of the King's wards in sending out the writs concerning the office to be found after the decease of her husband.