Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern celestial hemisphere. Some star atlases during the early 19th century, such as Urania's Mirror shown here, also depicted Perseus holding onto the head of the Medusa, an asterism named Caput Medusae. The constellation is located near several others named after ancient Greek legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north.Illustration: Sidney Hall; restoration: Adam Cuerden