The Cornish Foreshore Case was a case of arbitration between the Crown and the Duchy of Cornwall between 1854 and 1858. Officers of the Duchy successfully argued that the Duchy enjoyed many of the rights and prerogatives of a county palatine and that although the Duke of Cornwall was not granted Royal jurisdiction, was considered to be quasi-sovereign within his Duchy of Cornwall. The arbitration, as instructed by the Crown, was based on legal argument and documentation which led to the Cornwall Submarine Mines Act 1858. The Arbitrator was Sir John Patteson who communicated with the appropriate officers of the Crown and Duchy. The law officer representing the Duchy was the Rt. Hon.Thomas Pemberton Leigh, Baron Kingsdown.