You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: PLAYWRIGHTS 
Clue: His 1840s romance with an older housemaid in Grimstad may have inspired his later themes of guilt & social hypocrisy
henrik ibsen