The lost black

Almost every wizard knows the Black Family. They know of the Gryffindor Black, and the Slytherin Death eater Black. Wizards know of the Weasleys, and the Potters. They know of the Hufflepuffs and the Ravenclaws. The most known story that has been heard of in the wizard world is the story of the lost black. The twin sister of the Gryffindor Black.