Aristophanes’ Frogs, first performed in 405 BCE, is an important milestone in Greek cultural history. The play is evidence of the beginnings of the establishment of a literary canon in Athens. The paper shows that the deaths of Euripides and Sophocles, in combination with the emergence of a reading culture, marked a break in the ways in which tragedy was perceived in Athens. It makes use of Jan Assmann’s concept of a transition from ritual to textual continuity to explore this capital step in the process of the canonization of ‘classical’ tragedy that would arrive at its fulfilment in the course of the fourth century BCE.