Answer: ivaniv

AnswerCrossword Clue
IVANIVFirst Russian tsar
IVANIV"The Terrible" tsar
IVANIVCzar nicknamed "the Terrible"
IVANIVFirst tsar of Russia
IVANIVDespot called "the Terrible"
IVANIV"Terrible" ruler
IVANIV"The Terrible" czar
IVANIVA k a the Terrible
IVANIV"Terrible" czar
IVANIVFirst monarch to be crowned Tsar of All Russia
IVANIVCzar known for his mental instability