23h

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Across
  1. 1. - Hero of the Trojan War (7 letters, seven)
  2. 7. - Russian citadel (7 letters, seven)
  3. 9. - Empire based in present-day Turkey (7 letters, seven)
  4. 12. - Period of cultural rebirth in Europe (11 letters, eleven)
  5. 13. - Document limiting the king's power (10 letters, ten)
  6. 14. - Renaissance polymath (8 letters, eight)
  7. 15. - Ancient city destroyed by Vesuvius (7 letters, seven)
Down
  1. 2. - Classical Greek philosopher (8 letters, eight)
  2. 3. - Final battle of the American Revolution (8 letters, eight)
  3. 4. - Norse mythological hall of the slain (8 letters, eight)
  4. 5. - First imperial dynasty of China (3 letters, three)
  5. 6. - Persian king (6 letters, six)
  6. 8. - WWII D-Day invasion site (8 letters, eight)
  7. 10. - Scottish freedom fighter (7 letters, seven)
  8. 11. - Member of a medieval Christian military order (7 letters, seven)