Anna Ivanovna Abrikosova (Russian: Анна Ивановна Абрикосова; 23 January 1882 – 23 July 1936), later known as Mother Catherine of Siena, O.P. (Russian: Екатери́на Сие́нская or Ekaterina Sienskaya), was a Russian Greek-Catholic religious sister, literary translator, and victim of Joseph Stalin's concentration camps. She was also the foundress of a Byzantine Catholic community of the Third Order of St. Dominic which has gained wide attention, even among secular historians of Soviet repression. In an anthology of women's memoirs from the GULAG, historian Veronica Shapovalova describes Anna Abrikosova as, "a woman of remarkable erudition and strength of will", who, "managed to organize the sisters in such a way that even after their arrest they continued their work." She is also mentioned by na