Abstract
Aristotle’s dialogue Protrepticus is not only his earliest work of ethics but also the root of all his
subsequent investigations into ethics. Here we explore the various ways Aristotle retained in memory
the contents of the Protrepticus and redeployed them in the Eudemian Ethics, including the common
books. Since Aristotle himself does not explicitly acknowledge the foundational significance of the
Protrepticus to his later works, our exploration must proceed on the basis of our knowledge of the
earlier work, which can then related to comparable passages in the treatises. But the Protrepticus is a
lost work, unlike the EE and the EN, in the sense that no medieval manuscripts of it have survived.
And so it first needs to be reconstructed on the basis of the streams of reception that deposited
information in surviving works by later ancient authors. We begin in part 1 by reviewing the
surviving evidence of the Protrepticus before presenting our wider reconstruction and conception of
the work as a dialogue in part 2. In part 3, we discuss ideas and arguments in the reconstructed
dialogue that are retained and redeployed in the Eudemian Ethics, focussing on the account of
intellectual virtues in EE v and the introduction and methodological framework in EE i-ii.1.