The paper is devoted to moot points and versions of the biography of Dasha Sevastopolskaya (Daria Lavrentievna Mikhailova) who was the heroine of the Crimean campaign (1854-1855). An orphan since a young age, she organized a simple mobile dressing point with her own means, and went to the Crimean battlefield where she took care of the wounded and sick warriors during the Battle of Alma and in besieged Sevastopol. Various versions of the year of her birth, the origin of her surname and patronymic, her status in terms of that time are discussed. The paper is based on publications of her contemporaries, literary sources of the 19th and 20th centuries and modern data, as well as on The Sevastopol letters by the Great Russian surgeon Nicolay Pir...