First known as a kephalaion in Greek, capitulum or caput in Latin, the chapter arose in antiquity as a finding device within long, often heterogenous prose texts, prior even to the advent of the codex. By the 4th century ce, it was no longer unusual for texts to be composed in capitula; but it is with the advent of the fictional prose narratives we call the novel that the chapter, both ubiquitous and innocuous, developed into a compositional practice with a distinct way of thinking about biographical time. A technique of discontinuous reading or “consultative access” which finds a home in a form for continuous, immersive reading, the chapter is a case study in adaptive reuse and slow change. One of the primary ways the chapter became a narrative form rather than just an editorial practice is through the long history of the chaptering of the Bible, particularly the various systems for chaptering the New Testament, which culminated in the early 13th century formation of the biblical chaptering system still in use across the West. Biblical chapters formed a template for how to segment ongoing plots or actions which was taken up by writers, printers, and editors from the late medieval period onward; pivotal examples include William Caxton’s chaptering of Thomas Malory’s Morte d’Arthur in his 1485 printing of the text, or the several mises en proses of Chrétien de Troyes’s poems carried out in the Burgundian court circle of the 15th century. By the 18th century, a vibrant set of discussions, controversies, and experiments with chapters were characteristic of the novel form, which increasingly used chapter titles and chapter breaks to meditate upon how different temporal units understand human agency in different ways. With the eventual dominance of the novel in 19th-century literary culture, the chapter had been honed into a way of thinking about the segmented nature of biographical memory, as well as the temporal frames—the day, the year, the episode or epoch—in which that segmenting occurs; chapters in this period were of an increasingly standard size, although still lacking any formal rules or definition. Modernist prose narratives often played with the chapter form, expanding it or drastically shortening it, but these experiments usually tended to reaffirm the unit of the chapter as a significant measure by which we make sense of human experience.