this topic is more strongly associated with his fellow sophist Prodicus. In his eponymous Platonic dialogue, Protagoras interprets a poem by Simonides, focusing on the use of words, their literal meaning, and the author's original intent. This type of education would have been useful for the interpretation of laws and other written documents in the Athenian courts. Diogenes Laërtius reports that Protagoras devised a taxonomy of speech acts, such as assertion, question, answer, command, etc. Aristotle also says that Protagoras worked on the classification and proper use of grammatical gender. The titles of his books, such as Technique of Eristics (Technē Eristikōn, literally "Practice of Wranglings"— wrestling used as a metaphor for intellectual debate), prove that Protagoras also was a teacher of rhetoric and argumentation. Diogenes Laërtius states that he was one of the first to take part in rhetorical contests in the Olympic games. Eusebius quoting Aristocles of Messene says that Protagoras was a member of a line of philosophy that began with Xenophanes and culminated in Pyrrhonism. Relativism Protagoras also said that on any matter, there are two arguments (logoi) opposed to one another. Consequently, he may have been the author of Dissoi logoi, an ancient Sophistic text on such opposing arguments. According to Aristotle, Protagoras was criticized for having claimed "to make the weaker argument stronger". Protagoras is credited with the philosophy of relativism, which he discussed in his lost work, Truth (also known as Refutations). Although knowledge of Protagoras' position is limited, his relativism is inferred from one of his most famous statements: "Man is the measure of all things: of the things that are, that they are, of the things that are not, that they are not." Protagoras appears to have meant that each individual is the measure of how things are perceived by that individual. Therefore, things are, or are not, true according to how the individual perceives them. For example, Person X may believe that the weather is cold, whereas Person Y may believe that the weather is hot. According to the philosophy of Protagoras, there is no absolute evaluation of the nature of a temperature because the evaluation will be relative to who is perceiving it. Therefore, to Person X, the weather is cold, whereas to Person Y, the weather is hot. This philosophy implies that there are no absolute "truths". The truth, according to Protagoras, is relative, and differs according to