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

Who has written a series of novels, entitled The Dark Tower, of which the first, in 1982, was entitled, The Gunslinger?
the dark tower

Laurence Olivier directed and starred in a 1944 film, which began in the Globe Theatre and then gradually shifted to a realistic evocation of the Battle of Agincourt, which was adapted from which one of Shakespeare's plays?
battle of agincourt

Who played Curly in Coronation Street?

curly watts