Three worlds

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Across
  1. 3. Alphabet devised for illiterate Slavs
  2. 4. Mecca's holy precinct
  3. 6. The Great 'what' in 1054
  4. 8. Formerly Byzantium
  5. 9. Practiced by Islamic doctors but outlawed in the Christian world
  6. 11. Series of holy wars
  7. 12. People of the west
  8. 16. Muhammad's occupation
  9. 17. Pilgrimage
  10. 18. Triad of Jewish, Christian and Islam; People of the 'what'?
Down
  1. 1. Islamic polity
  2. 2. Universal
  3. 3. Emperor and early defender of Christianity
  4. 5. Pope who called for crusade
  5. 6. Branch of Islam believing God vests leadership in descendants of Muhammad's son-in-law
  6. 7. Holy war
  7. 10. Modern country where the Caliphate of Cordoba was established
  8. 13. Claimed to be the true keepers of the prophet Muhammad's tradition
  9. 14. Islamic world or community
  10. 15. Claimed to be original Christian faith; the 'what' Church