Ioan IV, Tsar of Russia

Ioan IV Vasilievich, also known as Ivan the Terrible, (25 August 1530 - 28 March 1584) was the Grand Prince of Moscow (1533 - 1547) and the first tsar of All Rus' (1547 - 1584). He was the first official son of Vasili III and his second consort Elena I, and the older brother of Yuri, the uncle of the late Vasili through his brother. It was rumoured that his father's first wife, Saint Sofiya of Suzdal, had a son - George Vasilievich - a few months after their divorce but it was not confirmed. He married multiple woman and had multiple issue:

With Anastasiya Romanovna, he sired: Anna Ioannovna, Mariya Ioannovna, Dmitri Ioannovich, Ioan Ioannovich, Yevdoksiya Ioannovna, and Fyodor I. She was chose by Ioan as his bride, and she helped keep his volatile personality in check. However, when she died of Mercury poisoning, he had a emotional collapse. Although he didn't have proof of the poisoning, he tortured and executed many of the Boyars, who he hated for their abusive behaviour in his childhood. Due to Anastasiya's death, he created the oprichniki who terrorised people on his behalf.

He married Mariya, who gave him a son: Vasili Ioannovich. However, Vasili died weeks after his death. Soon, Mariya got poisoned, and Ioan tortured many people on suspicion of assassination.