Andromeda is a constellation in the northern sky. It is named after the princess Andromeda in Greek mythology. It is sometimes called "Princess of Ethiopia" or "the Chained Woman" in English. It has also been called "Persea" ("Perseus's wife") or "Cepheis" ("Cepheus's daughter"). The astronomer named Ptolemy listed Andromeda when he made a list of 48 constellations. It is also one of the 88 constellations made by the International Astronomical Union.