sentences:  The two volumes of "Folkunga Trädet" ("The Tree of the Folkungs", 1905–07) are the inspired, epic story of a clan of Swede chieftains in the Middle Ages.In 1910 a controversy was waged in Swedish newspapers between a number of Swedish literary men on the topic of the proletarian “degradation” of literature, the protagonists of the two opposing camps being August Strindberg and Heidenstam.Professors Lidforss and Böök also took part.