Thomas Stanley, 1st Earl of Derby, KG (1435 - July 29, 1504), was King of the Isle of Man and an English nobleman and stepfather to King Henry VII of England.
He was the son of Thomas Stanley, 1st Baron Stanley, and Joan Goushill, daughter of Sir Robert Goushill and Elizabeth FitzAlan, daughter of Richard Fitzalan, 11th Earl of Arundel. After the death of his father in 1459, Stanley inherited his father's titles, including that of King of the Isle of Man and Baron Stanley. Stanley owned what is now Tatton Park in Cheshire. Stanley remained in favour with successive kings throughout the Wars of the Roses until his death in 1504. His marriage to Eleanor, sister of Richard Neville, Earl of Warwick, did him no harm, even after Warwick was toppled from power, and took his second wife Margaret Beaufort, whose son, Henry Tudor, was the leading Lancastrian claimant to the throne.
Thomas Stanley is also suspected for the death of the Princes in the Tower but this is unproven.
King Richard III of England unwisely continued to trust Thomas Stanley and his brother, William, even after he had briefly imprisoned Thomas in 1483 on suspicion of conspiracy. At the Battle of Bosworth Field, the Stanleys betrayed him, coming in on the side of the Lancastrians at a crucial moment. Thomas is alleged to have retrieved Richard's lost crown from the battlefield and placed it on the head of his own stepson. In recognition, Henry created him Earl of Derby on October 27, 1485, and his fortunes continued to flourish. His brother, William, made the mistake of supporting the pretender Perkin Warbeck, and was executed for treason in 1495.
Descendants of Thomas Stanley and Eleanor (or Alainor) Neville included George Stanley, Edward Stanley, and James Stanley, all of whom were also descended from the same Beauforts and John of Gaunt as was the stepson who became King Henry VII.
Thomas Stanley 
