The development of Belarusian literature, spreading the idea of nationhood for the Belarusians, was epitomized by the literary works of Yanka Kupala (1882–1942) and Yakub Kolas (1882–1956). The works of these poets, along with several other outstanding writers, became the classics of modern Belarusian literature by writing widely on rural themes (the countryside was where the writers heard the Belarusian language) and by modernizing the Belarusian literary language, which had been little used since the sixteenth century. Postindependence authors in the 1990s continued to use rural themes widely.