By the late 19th century, in the Golden Age of Norwegian literature, the so-called "Great Four" emerged: Henrik Ibsen, Bjørnstjerne Bjørnson, Alexander Kielland, and Jonas Lie. Bjørnson's "peasant novels", such as ''Ein glad gut'' (A Happy Boy) and ''Synnøve Solbakken'', are typical of the Norwegian romantic nationalism of their day. Kielland's novels and short stories are mostly naturalistic. Although an important contributor to early romantic nationalism, (especially ''Peer Gynt''), Henrik Ibsen is better known for his pioneering realistic dramas such as ''The Wild Duck'' and ''A Doll's House.'' They caused an uproar because of his candid portrayals of the middle classes, complete with infidelity, unhappy marriages, and corrupt businessmen.