Cassiopeia can refer to: Cassiopeia (or Casseipeia), a queen of Aethiopia in Greek mythology. See also Boast of Cassiopeia. Cassiopeia , a northern constellation representing the queen. Cassiopeia A, a supernova remnant in that constellation. Cassiopeia, Korean boyband TVXQ's (also known as DBSK)'s official fanclub Cassiopea, the genus of the "upside-down" jellyfish Cassiopeia , an overnight rail service in Japan. Cassiopea , the fi