Earl of Salisbury children: to his son Edward in 1485 until his execution for treason in 1499, and to Edward's sister, Margaret Pole, Countess of Salisbury, in 1513 until she was also executed, and the title again forfeited, in 1539. In 1605 the title was given to Robert Cecil, 1st Earl of Salisbury, a close advisor to James I. Cecil was a son of Queen Elizabeth I's chief advisor, William Cecil, 1st Baron Burghley. For information on this creation, see the Marquess of Salisbury. Some sources call Edward Plantagenet, 17th Earl of Warwick (1475–1499) also Earl of Salisbury, but "there is no reason
Earl of Shelburne Earl of Shelburne Earl of Shelburne is a title that has been created two times while the title of Baron Shelburne has been created three times. The Shelburne title was created for the first time in the Peerage of Ireland in 1688 when Elizabeth, Lady Petty, was made Baroness Shelburne. She was the wife of the noted economist Sir William Petty. The title was for life only and became extinct on her death in circa 1708. On the same day that Lady Shelburne was elevated to the peerage, her eldest son by Sir William Petty, Charles Petty, was also raised