Who was the first Earl of Salisbury and Chief Minister to King James I?
John Tradescant the Elder:  He began his career as head gardener to Robert Cecil, 1st Earl of Salisbury at Hatfield House, who initiated Tradescant in travelling by sending him to the Low Countries for fruit trees in 1610/11. Hatfield House:  The present Jacobean house, a leading example of the prodigy house, was built in 1611 by Robert Cecil, First Earl of Salisbury and Chief Minister to King James I and has been the home of the Cecil family ever since.
Robert Cecil