5h

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Across
  1. 3. - South American civilization in the Andes Mountains (4 letters, four)
  2. 7. - Eastern Roman Empire after the fall of Rome (9 letters, nine)
  3. 8. - Period after Alexander the Great's conquests (12 letters, twelve)
  4. 9. - Ancient empire in modern-day Iran (6 letters, six)
  5. 11. - Ancient civilization along the Nile River (5 letters, five)
  6. 12. - Nomadic people who established an empire in Asia (6 letters, six)
  7. 14. - Mesoamerican civilization known for its calendar (4 letters, four)
  8. 15. - Capital of the ancient Roman Empire (4 letters, four)
Down
  1. 1. - One of the world's oldest continuous civilizations (5 letters, five)
  2. 2. - Norse seafarers and traders (6 letters, six)
  3. 4. - Indigenous people of central Mexico (5 letters, five)
  4. 5. - Birthplace of democracy and philosophy (6 letters, six)
  5. 6. - Ancient city-state in North Africa (8 letters, eight)
  6. 10. - Turkish empire that lasted for centuries (7 letters, seven)
  7. 13. - Ancient city-state in Mesopotamia (7 letters, seven)