Bellatrix Black was born to Cygnus and Druella Black in 1951. She was the eldest of three girls: Bellatrix, Andromeda and Narcissa Black. She most likely had an unhappy childhood and probably met her future husband Rodolphus Lestrange while she was at Hogwarts. Bellatrix was less well.. deranged and more like an almost normal girl/young woman until she met Voldemort.