[4] He joined the Duke during the Battle of the Spurs, and took part in the Siege of Thérouanne, which involved the Tudors and Habsburgs against the Kingdom of France.
He kept close relationship with Sir Rhys ap Thomas, of the Welsh Royal House of Dinefwr, who also fought at the Battle of the Spurs with the King.
[2][3] One of their sons, Edward Griffith, was a correspondent of Thomas Cromwell, and joined Sir William Brereton to Ireland for a military campaign, and was made a member of the Privy Council.
[4] Brereton was later Groom of the Privy Chamber to Henry VIII, and was executed in relation to Queen Anne Boleyn adultery charges.
[4] Their family were allies and kinsmen of Prince Owain Glyndwr and Lord Tudur ap Gruffudd, of the Royal House of Mathrafal, during the Welsh war of independence.