Random Trivia: Hard

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Across
  1. 4. Billy the Kid's real name
  2. 6. The year the Mona Lisa was painted
  3. 8. A male horse is known as a colt until age ???
  4. 9. Present participle of lie
  5. 12. They were used to make coffee during the Civil War
  6. 13. Chief Roman silver coin
  7. 14. Female chicken between the age of 8 weeks and 1 year
  8. 15. Element with 100 protons
Down
  1. 1. "It is far safer to be feared than loved." -???
  2. 2. Known as the "Mad Monarch"
  3. 3. Country with Mt. Kilimanjaro
  4. 5. Population of Yemen in 2010, rounded to the nearest whole
  5. 7. Cincuenta in English
  6. 10. Country that formerly ruled Iceland
  7. 11. Fear of wealth