Ivan Ivanovich of Russia

Ivan Ivanovich (Ива́н Иванович) (28 March 1554 – 19 November 1581) of the House of Rurik, was Tsarevich - the heir apparent - of the Tsardom of Russia, being the second son of Ivan the Terrible and Anastasia Romanovna, and elder brother of Feodor.

Ivan was assassinated by Assassins, but the cause of death is commonly believed by historians to be a hit of his father's staff after an argument between the two occured.