In this lecture, Professor Donald Kagan explores the development and character of Sparta. He points out that in Sparta, the ethos of the polis was present to an extraordinary degree. Then he describes how this came about. In short, Professor Kagan argues that the Spartans were able to create a distinct military culture on account of their subjugation of the inhabitants of Messenia, who were forced to carry on the work of farming while the Spartans trained for war. Finally, Professor Kagan examines the education and training of the Spartan citizen as well as the constitution of Sparta.