Cassiopeia

I DO NOT THE CHARACTERS, THE CHARCTERS BELONG TO JK ROWLING "Cassiopeia Walburga Black was the daughter of Orion and Walburga Black, the twin sister of Regulus Arcturus Black, making her the younger sister of the notorious Sirius Orion Black. She seemingly vanished from not only the Wizarding World, but the entire world without a trace on her 18th birthday. Just 3 days later, her twin brother was confirmed dead, many believe at the hands of the Dark Lord. There is much speculation about the disappearance of Cassiopeia and the death of Regulus including that Sirius Black killed them both and somehow dissolved his sister's body, meanwhile it was confirmed by the house elf of the siblings that Regulus died at sea, although few believe that to be true." Harry read from 'The History of the Noble and Most Ancient House of Black' to Hermione and Ron, who sat on the ground opposite of him, listening carefully.