This article explores Herodian's History of the Roman Empire alongside Chariton's novel Callirhoe with an eye to how the minds of collective entities are represented and function in the two narratives. It argues that Chariton, unlike Herodian, elaborates on the diversity of emotions that characterizes a specific collective experience and has groups use direct speech throughout. These choices add vividness to the narrative and intensify the fictional sensationalism and dramatic character of the novel. It also shows that, whereas collectives in Chariton's narrative are primarily designed to highlight a specific characteristic of a hero, dramatize an event and enhance suspense, in Herodian's historiography they are an integral part of the plot and central to his historical analysis of contemporary political and social world. This article offers a new analytical tool geared towards the development of a poetics of the collective in ancient narrative as well as a poetics of fictional and factual narration in antiquity, and advances our understanding of the complex relationship between ancient historiography and novelistic writing.