I·van III Va·sil·ie·vich 
(īvən, ē-vän; və-sĭlyə-vĭch′) Known as "Ivan the Great." 1440-1505.
(īvən, ē-vän; və-sĭlyə-vĭch′) Known as "Ivan the Great." 1440-1505. Grand duke of Muscovy (1462-1505). His victories against the Tatars laid the foundation for eventual Russian unity.