It reverted to the Crown on Fitzwilliam's death and was granted in 1545 to Thomas Seymour, brother to Edward Seymour, 1st Duke of Somerset, Protector (of the infant King Edward VI, son of King Henry VIII).
In 1541, Horsley was granted to Thomas Seymour.
He appeared in the television mini-series The Six Wives of Henry VIII and Elizabeth R as Thomas Seymour.
Sir John Say of Baas, of Little Berkhamsted and Sawbridgeworth, and of Lawford
At the beginning of Edward's reign, he was nine years old and his eldest uncle, Edward Seymour, 1st Duke of Somerset, was Lord High Protector of England, while another uncle, Thomas Seymour, 1st Baron Seymour of Sudeley, married Henry VIII's widow, Catherine Parr; both Edward and Thomas Seymour were executed for treason.
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Catherine's family play a key role including her sister Anne Parr Herbert, her stepdaughter Elizabeth, niece Jane Grey, doomed friend Anne Askew, rivals Thomas Wriothesley, Stephen Gardiner, Henry Howard, Anne Stanhope, Mary Howard Fitzroy the Dowager Duchess of Richmond and former romantic interest Thomas Seymour.