The term 'IVAN' can be solved by the crossword solution 'TSAR', which is a four-letter word. TSAR is a title used to refer to the monarchs of Russia from 1547 to 1917. The most famous TSAR was Ivan IV, also known as Ivan the Terrible, who was the first Russian ruler to take the title of TSAR in 1547. He was the first ruler of the Rurik dynasty and is remembered for his expansion of the Russian Empire and his reign of terror.