On 9th May 1536, King Henry VIII sent a message to Thomas Cromwell “commanding him to repair to the King to treat of matters relating to the surety of his person, his honor, and the tranquillity of the realm” and also summoned a number of noblemen and gentlemen to a council meeting.
While Henry VIII was meeting with his council, the Justices of the King’s Bench were sending orders to the sheriffs of London to assemble a grand jury at Westminster on 10th May to rule on offences alleged to have taken place in Middlesex (at Whitehall and Hampton Court Palace). You can read more about this, including a list of men sworn in, in my article 9 May 1536 – Meetings and Legal Proceedings.