The castle of Semur-en-Brionnais is located in Semur-en-Brionnais in Saône-et-Loire , at the narrowest point of a rocky spur. This castle is the subject of a registration as a historic monumentsince1 . The castle of Semur-en-Brionnais is one of the oldest in Burgundy 2 . It is also the birth place of St. Hugh .