Symeon of Trier was a late 10th-century monk and recluse born in Syracuse, Sicily. After traveling to Constantinople to study Greek, he spent time as a pilgrim guide before seeking a life of solitude. He lived as a monk in Bethlehem and at Saint Catherine's Monastery on Mount Sinai, where he was ordained a deacon. Following various travels through France and Germany, he eventually settled as a hermit within the Porta Nigra in Trier. He is recognized as a saint in the Catholic and Eastern Orthodox traditions.