Elena Glinskaya, Grand Princess and regent of Russia
Elena Vasilyevna Glinskaya (Russian: Елена Васильевна Глинская; c. 1510 – 4 April 1538) was the Grand Princess consort of Russia, as the second wife of Grand Prince Vasili III and de facto regent of Russia for 5 consecutive years, from 1533 until her death in 1538. She was the mother of Tsar Ivan the Terrible.