Term: Ivan the Terrible, Description: Grand Prince of Moscow and 1st Tsar of Russia, Question: Was 847 Pope Leo same iteration of his name as Ivan the Terrible?, Answer:Yes
Fact1: Pope Leo in 847 AD was the fourth Leo to have that name and was called Leo IV. Fact2: Ivan the Terrible was the 4th Tsar to have the name Ivan and was known as Ivan IV Vasilyevich. 