ANSWERS

1. Constantine the Great. The city was Constantinople (now Istanbul).

2. Spencer Perceval, shot by John Bellingham

3. Minnesota

4. Thailand

Siam first changed its name to Thailand in 1939, switched back to Siam in 1945, and finally became Thailand again in 1949.

5. Deep Blue, against Garry Kasparov

6. Bob Marley, of the Wailers (Bob Marley and the Wailers)

7. "Cats"

8. The Academy of Motion Picture Arts and Sciences

9. David Cameron, with Nick Clegg as deputy

10. Salvador Dalí. The painting is famous for its melting clocks.

11. Irving Berlin. He was born in the Russian Empire.

Irving Berlin was born in the Russian Empire, probably in what is now Belarus. Sources disagree on the exact town, so "Russia" or "the Russian Empire" is the safest answer.

12. Richard Feynman

13. Margaret Rutherford

14. Eric Burdon

15. Chang and Eng Bunker

16. William Pitt the Elder

17. Sir John Herschel

18. Martha Graham

19. His fourth

20. Glacier National Park