At least four of the five Poetical Books cohere in terms of their traditional authorship. Many of the Psalms contain superscriptions or titles incorporating “of David,” and many early Jewish and Christian traditions attribute all 150 of the Psalms to David. Proverbs 1.1 (“The proverbs of Solomon son of David, king of Israel”), 10.1, and 25.1 explicitly attribute (sections of) that book to Solomon. Ecclesiastes, in its opening chapter, presents itself as the work of “the Teacher, when king over Israel in Jerusalem” ( 1.12; cf. 1.1 ); premodern Jewish and Christian tradition understood this royal teacher to be Solomon, who is described in 1 Kings as being exceedingly rich, just like the protagonist of Ecclesiastes. Finally, the Song of Solomon opens with an explicit (but secondary) note concerning its author: “the Song of Songs, which is Solomon's.” Given the clear connection of Psalms, Proverbs, Ecclesiastes, and Song of Solomon to David and Solomon, it is not surprising that some early Christian interpreters connected Job as well to the period of Solomon. This canonical division of five books thus likely came into being as the compilations connected to David and Solomon, and was only secondarily labeled the “Poetical Books.” The traditional attributions of authorship, however, have been rejected by modern scholars; see the Introduction to each book for a detailed discussion.