Periodization

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Across
  1. 3. the Age of Reason
  2. 5. Muslim
  3. 6. to speed up
  4. 7. the surname of the inventor of the mechanical movable type printing press
  5. 12. to open
  6. 13. dangers, risks
  7. 14. to change substantially
  8. 15. to message
Down
  1. 1. modern
  2. 2. gathering, collecting
  3. 4. a region that includes Italy, Greece etc.
  4. 8. the ruler of an empire
  5. 9. the opposite of rise
  6. 10. usually
  7. 11. 100 years
  8. 12. to announce