Czar Nicholas II is shown with his family in the 1910s. All were executed shortly after the 1917 Russian Revolution. Remains of the czar, his wife, Alexandra (top right) and their children — Olga (from left), Maria, Anastasia, Alexei and Tatiana — have all been identified. Now the Russian Orthodox Church has ordered new DNA tests to confirm the identities of Maria and Alexei.
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