Athenian society was composed of four main social classes - slaves, metics (non-citizen freepersons), women, and citizens, but within each of these broad classes were several sub-classes (such as the difference between common citizens and aristocratic citizens). Meanwhile, The population of Sparta consisted of three main groups: the Spartans, or Spartiates, who were full citizens; the Helots, or serfs/slaves; and the Perioeci, who were neither slaves nor citizens. Spartan men devoted their lives to military service, and lived communally well into adulthood.