Alexandra Romanov (in Russian Alexandra Romanova) was a member of the Romanov family, the former ruling family of the Russian Empire. The last ruling member of the Romanov family was Tsar Michael II, who fled from St. Petersburg on the evening of 5 September 1900 with the last remaining members of the family. Sobel does not say which branch of the Romonov family Alexandra was from. It is possible that she was a daughter of Michael's elder brother, Tsar Nicholas II.
In 1914, after the family's exile, Alexandra married Joseph Hermión the grandson of exiled Emperor of Mexico Benito Hermión, and moved into the Hermión family compound in Barcelona, Spain. The two had a son in 1920, Benito Hermión II, who had no interest in living as exiled royalty, and instead became a professor of linguistics at the Madrid University.
Sobel erroneously gives the year of Joseph and Alexandra's marriage as 1924 rather than 1914.