The only problem as probably you know Oagre, is that the epithet Grozny applied to Tsar Ivan IV Ива́н Гро́зный in Russian means: awe-inspiring, formidable, mighty, powerful, strict.
Not: cruel or horrible.
Ivan IV was for all practical purposes the founder of the "modern" Russian State and is still greatly respected for that. At the same time after the death of his first wife (and the great love of his life) Tsarina Anastasia Romanovna he did become increasingly disordered. Then again any of us having lived his life might have become mentaly disordered as well! Including possibly the murder of his eldest surviving son Tsarevich Ivan Ivanovich which precipitated the end of the Rurikid Dynasty and the Time of Troubles in the next generation (although there are still junior branch Rurikid today).
Repin's 1885 painting
Ivan the Terrible and His Son Ivan on November 16th, 1581
http://en.wikipedia.org/wiki/File:RE...ble&Ivan.jpg