). Other retroactively recognized important SNe are SN 1006 (in Lupus ), SN 1054 (in Taurus ), SN 1572 (in Cassiopeia ), SN 1604 (in Ophiuchus ), and SN 19885A (in the Andromeda Galaxy (M31) ). SN 1054 is famous for having given birth to the Crab nebula supernova remnant and