Anastasia Romanovna Zakharyina (died August 7, 1560) was the first wife of the Russian Tsar Ivan the Terrible and the first Russian tsarina. She was the daughter of boyar Roman Zakharyin, who gave his name to the Romanov Dynasty of Russian monarchs. She was selected as the best bride for Ivan from a large number of suitable mates, brought to the Kremlin specifically for the selection process. Wikipedia
The definitive Wikipedia entry for Anastasia Of Russia. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Anastasia_of_Russia