History puzzle 1

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Across
  1. 2. He wrote "The Communist Manifesto" (last name)
  2. 7. He invented the telephone (last name)
  3. 9. Dominant social system in medieval Europe
  4. 10. British Prime Minister during most of World War II (last name)
  5. 11. Greek philosopher that taught Alexander the Great
  6. 13. The Russian Revolution of 1917 resulted in the rise of this leader (last name)
  7. 14. This country hosted the first modern Olympics
  8. 15. He wrote the U.S. Declaration of Independence (last name)
  9. 16. The primary language of the Roman Empire
  10. 20. Name of the ship that sank in 1912
  11. 21. The first female Prime Minister of the United Kingdom (last name)
  12. 22. The first President of the United States (last name)
  13. 23. The first emperor of Rome
  14. 24. Name of the ancient Egyptian sun god
Down
  1. 1. The first Holy Roman Emperor
  2. 3. The name of the Aztec capital (without accent marks)
  3. 4. This civilization developed cuneiform writing
  4. 5. He is known as the "father of modern physics" (last name)
  5. 6. He discovered penicillin (last name)
  6. 8. Primary religion of the Byzantine Empire
  7. 12. The "Epic of Gilgamesh" comes from this ancient civilization
  8. 17. This country was blamed for starting WWI in the Treaty of Versailles
  9. 18. The leader of the Soviet Union during World War II
  10. 19. This city was the center of the Islamic Golden Age