Why is ivan iv called ivan the terrible?

Ivan the Terrible and his son Ivan on Friday, 16 November 1581 better known as Ivan the Terrible killing his son. hope this helps plz mark me down as brainliest

b) brahmans   is nomadic society

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.