St Symeon or Port St Symeon (Turkish: Samandağ or Suadiye) was the medieval port for the Frankish Principality of Antioch, located on the mouth of the Orontes River. It may be named after Saint Simeon Stylites the Younger, who dwelt on a mountain only six miles from St Symeon, or the original Saint Simeon Stylites, who was buried in Antioch. Seleucia Pieria had been the Roman port of Antioch, but silting and an earthquake had rendered it unusable. Control of St Symeon was important to the capture of Antioch by the Crusaders at the end of the eleventh century.