Helene Pavlovna Demidoff, Principessa di San Donato (1884-1959) (1884–1959) Parents Yelena Trubetskaya Pavel Pavlovich Demidov, 2nd Prince of San Donato Children Paul Sheriff Countess Helene Schouwalow Siblings Maria Pavlovna Demidova Paul Pavlovich Demidoff, Principe di San Donato Aurora Pavlovna Demidova Nikita Pavlovich Demidoff, Principe di San Donato Anatoly Pavlovich Demidov, 4th Prince of San Donato Elim Demidov Partners Nicolas A. Pavlov Aleksandr Shuvalov