According to the tradition, the name Sirolo derives from "Sirio", a medieval condottiere. He was given the place where Belisareio built the castle after defeating the Goths in 560. Probably the area had already been settled during the Roman period and depended on the Municipality of Umana (today Numana). The small center, on the Conero slopes, shows unexceptionable medieval evidences and is lit by unique marine foreshortenings. It houses the offices of Consorzio Parco del Conero.