Why was Anastasia the last grand duchess famous?

It is known that the Bolsheviks killed the Czar and his family, however, for many years it was not entirely clear if Anastasia also died. In theory, had the Czarists (also known as White Russians) tried to overthrow the communist Dictatorship and bring back the monarchy, they would have needed Anastasia, as the last legitimate claimant to the throne. But that never happened, and it is now believed that Anastasia did die with the other members of her family, at the hands of the Bolsheviks.