 Whereas specialists are mostly agreed, in theory at least, about the new, broad conception of the geography of medieval philosophy, opinion about the period’s chronology remains divided. There is, indeed, a widespread view (e.g., De Rijk 1985: 1–64; Luscombe 1997: 1; Flasch 1986 [2000: 27–29]; Lagerlund 2020: v) that period divisions are unimportant and are chosen for purely practical reasons in order to allow for a division of labour. But, as will emerge below, the choice of period divisions makes a great difference to how the history of philosophy is written, and arguments can be made from the continuity and breaks in traditions for different periodizations (Marenbon 2011).