Great people of the past

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Across
  1. 2. What write wrote the biggest book about war?
  2. 4. This artist invented helicopter?
  3. 7. Who christened Ancient Rus in 988?
  4. 11. What writer are black cherry before the duel?
  5. 12. What is the name of the tsar who killes his son?
  6. 13. What English writer wrote a story about a man on an island?
  7. 14. This person saw table of elements in his dream?
Down
  1. 1. What writer wrote "Dead Souls"?
  2. 3. This artist couldn't paint animals but he painted "morning in a pine forest"?
  3. 5. What American musician had vitiligo?
  4. 6. Who invented a car?
  5. 8. What architect made a project for Hermitage building?
  6. 9. This person composed music for the news in USSR?
  7. 10. Who invented a light bulb?