Little Norwegian literature came out of the period of the Scandinavian Union and the subsequent Dano-Norwegian union (1387–1814), with some notable exceptions such as Petter Dass and Ludvig Holberg. In his play ''Peer Gynt'', Ibsen characterised this period as "Twice two hundred years of darkness/brooded o'er the race of monkeys." The first line of this couplet is frequently quoted. During the union with Denmark, the government imposed using only written Danish, which decreased the writing of Norwegian literature.