Ivan IV, know as Ivan the Terrible, is most known for his brutal ruling, centralised administration of Russia and expantion of the boundaries of the Russian Empire. In 1581, Ivan beat his pregnant daughter-in-law for wearing immodest clothing, and this may have caused a miscarriage. His son, also named Ivan, upon learning of this, engaged in a heated argument with his father, which resulted in Ivan striking his son in the head with his pointed staff, causing his son's death.