He was the father of Ivan the Terrible and the grand prince of Moscow from 1505 to 1533.
He was the son of Ivan the Terrible and the last Rurikid tsar of Russia from 1584 to 1598. He was mentally weak and influenced by his brother-in-law Boris Godunov.
He was the brother-in-law of Feodor I and the de facto ruler of Russia from 1585 to 1598. He was elected tsar by the Zemsky Sobor in 1598, but faced several pretenders and uprisings.
He was one of the pretenders who claimed to be the son of Ivan the Terrible and the rightful heir to the throne. He was supported by Poland and some nobles and invaded Russia in 1604. He was briefly crowned in 1605, but was killed soon after.
He was the first Romanov tsar of Russia and the founder of the dynasty that ruled until 1917. He was elected by the Zemsky Sobor in 1613, ending the Time of Troubles.