Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

The Byzantine Empire is the term used since the 19th century to describe the Roman Empire of the Middle Ages, centred on its capital, where?
byzantine empire

Which film director won the Oscar for Best Picture for the film 12 Years a Slave in 2013?
12 years a slave

'Oscar' winning actress Angelina Jolie is the daughter of which actor?
angelina jolie