Henry VIII (8th) is not a Russian czar.
Step-by-step explanation:
Czar refers to a Russian emperor.
Henry VIII was King of England from 1509 till he died in 1547. He succeeded his father Henry VII and was the second Tudor monarch. Since, he is the former king of England, hence he is not a Russian czar.
Others i.e Peter the Great, Catherine the Great and Alexander I are all former Russian czar with their in power time periods mentioned below:
Peter the Great : Emperor of All Russia ( 1682 - 1725)
Catherine the Great : Empress of Russia (1762-1796)
Alexander I : Emperor of Russia (1809 - 1825)