1. On 11 May 330, a Roman emperor dedicated a new capital city on the site of ancient Byzantium. Name the emperor and the city.

2. On 11 May 1812, the only British prime minister ever to be assassinated was shot in the lobby of the House of Commons. Name him and his killer.

3. Which state, nicknamed the "Land of 10,000 Lakes", joined the United States on 11 May 1858?

4. On 11 May 1949, Siam officially changed its name for the second time. What is it called?

5. On 11 May 1997, an IBM computer won a chess match against the reigning world champion. Name the computer and the champion.

6. A Jamaican reggae legend died on 11 May 1981, aged 36. Name him and his band.

7. The musical from your 22 March round, based on poems by the poet from your 4 January round, opened in London's West End on 11 May 1981. Which musical?

8. On 11 May 1927, an organisation was founded in Hollywood that later began handing out a famous golden statuette. What is it called?

9. On 11 May 2010, a new British prime minister entered Downing Street at the head of a coalition. Name him and his deputy.

10. A Spanish surrealist born in Figueres on 11 May 1904 painted "The Persistence of Memory". Who was he? What is the painting famous for?

11. The composer of "White Christmas", from your December round, was born on 11 May 1888. Name him. In which country was he born?

12. An American physicist born on 11 May 1918 dipped a rubber ring in iced water on live TV to show why the Space Shuttle Challenger exploded. Who was he?

13. An English actress born on 11 May 1892 played Miss Marple, from your 15 September round, in four films of the 1960s. Who was she?

14. A singer born in Newcastle on 11 May 1941 fronted The Animals on "The House of the Rising Sun". Who is he?

15. Twin brothers born joined together in Siam on 11 May 1811 became so famous that the term "Siamese twins" was named after them. What were their names?

16. A British prime minister nicknamed "the Great Commoner" collapsed in the House of Lords and died a month later, on 11 May 1778. Who was he?

17. An English scientist who coined the words "photograph", "negative" and "positive" died on 11 May 1871. He was the son of the astronomer from question 2 of your 11 January round. Who was he?

18. An American dancer and choreographer born on 11 May 1894 is often called the mother of modern dance. Who was she?

19. On 11 May 1502, Christopher Columbus set off from Spain on his last voyage to the Americas. Which number voyage was it?

20. Which US National Park in Montana, famous for its glaciers, was created on 11 May 1910?