Saint Olga (also called "Olga Prekrasa" (Ольга Прекраса), or "Olga the Beauty", Old Norse: "Helga"; born c. 890 died July 11, 969, Kiev) was a Pskov woman of Varangian extraction who married the future Igor of Kiev, arguably in 903. The Primary Chronicle gives 879 as her date of birth, which is rather unlikely, given the fact that her only son was probably born some 65 years after that date. Wikipedia
The definitive Wikipedia entry for Princess Olga Of Kiev. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Olga_of_Kiev
Prince Igor succeeded his father Oleg as the ruler of Kiev and its territories that now are parts of a number of present day nations: Russia, Ukraine, Belarus, and Poland. orthodoxwiki.org/Olga_of_Kiev