Periodisations are inevitable and useful short-cuts in conceptualising the past. But they are often inherited without reflection or a clear idea of their origins; in literature they can endow fashionable aesthetic judgements with lasting canonical force in ways that can be intellectually harmful. Latin is a language with a literary history of over two millennia, with highly differentiated levels of survival from different periods, and with a complex scholarly tradition: its periodisation is both important and challenging. I open with three vignettes of attitudes to Latin literature which in their different ways show the tendency to esteem antiquity above all. I look at six possible ways in which the history of Latin literature has been periodised or could be better periodised, with a recurring focus on two particularly dynamic periods : the last half-century before Christ and the fourth and fifth centuries of our era. An examination of changes in language, metre, prose rhythm, politics, religion and book history is used to challenge and test established periodisations, and to suggest the benefits of a greater acknowledgement of continuities and the longue durée.