Perseus is a constellation in the northern sky, named after the Greek hero Perseus. It was one of the 48 constellations listed by the 1st century astronomer Ptolemy, and remains one of the 88 modern constellations defined by the International Astronomical Union. It contains the famous variable star Algol (ß Per), and is also the location of the radiant of the annual Perseids meteor shower.

Andromeda is a constellation in the northern sky. It is named after Andromeda, the princess of a mythological kingdom Ethiopia in Greek mythology. It is most notable for containing the Andromeda Galaxy. It is sometimes called "the Chained Lady" or "the Chained Woman" in English, Mulier Catenata in Latin, al-Mar'at al Musalsalah in Arabic, as the mythological Andromeda was chained to a wall of rock before being rescued by Perseus.