42.

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Across
  1. 3. European migrant once saw capital of Hungary (4)
  2. 6. Capital of Hungary - a number one capital!
  3. 7. 5 in 9 29, a scoundrel, leading people round capital of Hungary (8)
  4. 9. Angry, making a lot of noise in parts of Hungary (5)
  5. 10. U D A former capital of Hungary
  6. 11. EMPIRE It once included most of Hungary
  7. 13. Sporty sort of Greek hosting heads of Hungary, Latvia and Estonia (8)
  8. 15. Nationality given away with Hungarian capital a day into survey (5,7)
  9. 17. Restless as loveless dog, become angry finally
  10. 19. Clean up what used to be the capital of Hungary
  11. 20. Capital of Hungary
Down
  1. 1. "Rome of Hungary"
  2. 2. Emperor has redeveloped Hungarian capital (4)
  3. 4. Member of the majority ethnic group of Hungary, or their Finno-Ugric language (6)
  4. 5. Frequent Hungarian capital with relative (5)
  5. 8. Capital of Hungary
  6. 10. Become angry from bishop"s unction (4)
  7. 12. Imre of Hungary
  8. 14. Maria ___, former queen of Hungary
  9. 16. Damaged capitals of Hungary, Uruguay, Russia and Turkey (4)
  10. 17. JOSEPH Son of Archduke Francis who became Emperor of Austria and King of Hungary (5,6)
  11. 18. When Andrew II became king of Hungary