Pythius (Greek: Πύθιος), also known as Pytheos (Greek: Πυθεός) or Pythis, was a Greek architect, architecture theorist, and sculptor of the 4th century BC. He designed the Temple of Athena Polias at Priene and the Mausoleum at Halicarnassus, which was regarded in antiquity among the Seven Wonders of the World. It is presumed that he came from the Greek city of Priene.[1] The first-century BC Roman architect Vitruvius called Pythius a "celebrated builder" (de Architectura I.1.12) and referenced lost treatises on architecture written in Greek by Pythius as sources for his Latin architecture manual de Architectura (I.1.15).[2]