From its origins in the Homeric and the aristocratic tradition, Greek education was vastly "democratized" in the 5th century BCE, influenced by the Sophists, Plato and Isocrates. In the Hellenistic period, education in a gymnasium was considered an inextricable essential for participation in the Greek culture. The value of physical education to the ancient Greek and Romans throughout history society has placed a different value on physical education and sport. There were two forms of education in ancient Greece: formal and informal. Formal education was attained through attendance to a public school or was provided by a hired tutor. Informal education was provided by an unpaid teacher, and occurred in a non-public setting. Education was an essential component of a person’s identity in ancient Greece, and the type of education a person received was based strongly in one’s social class, the culture of one’s polis, and the opinion of one’s culture on what education should include. Formal Greek education was primarily for males and non-slaves. In some poleis, laws were passed to prohibit the education of slaves. The Spartans also taught music and dance, but with the purpose of enhancing their maneuverability as soldiers.