popular, only one complete example of a satyr play has survived: Cyclops by Euripides. Large portions of a second satyr play, Ichneutae by Sophocles, have been recovered from the site of Oxyrhynchus in Egypt among the Oxyrhynchus Papyri. Historiography Two notable historians who lived during the Classical Era were Herodotus of Halicarnassus and Thucydides. Herodotus is commonly called "The Father of History." His book The Histories is among the oldest works of prose literature in existence. Thucydides's book History of the Peloponnesian War greatly influenced later writers and historians, including the author of the book of Acts of the Apostles and the Byzantine Era historian Procopius of Caesarea. A third historian of ancient Greece, Xenophon of Athens, began his Hellenica where Thucydides ended his work about 411 BC and carried his history to 362 BC. Xenophon's most famous work is his book The Anabasis, a detailed, first-hand account of his participation in a Greek mercenary army that tried to help the Persian Cyrus expel his brother from the throne, another famous work relating to Persian history is his Cyropaedia. Xenophon also wrote three works in praise of the philosopher Socrates: The Apology of Socrates to the Jury, The Symposium, and Memorabilia. Although both Xenophon and Plato knew Socrates, their accounts are very different. Many comparisons have been made between the account of the military historian and the account of the poet-philosopher. Philosophy Many important and influential philosophers lived during the fifth and fourth centuries BC. Among the earliest Greek philosophers were the three so-called "Milesian philosophers": Thales of Miletus, Anaximander, and Anaximenes. Of these philosophers' writings, however, only one fragment from Anaximander preserved by Simplicius of Cilicia has survived. Very little is known for certain about the life of the philosopher Pythagoras of Samos and no writings by him have survived to the present day, but an impressive corpus of poetic writings written by his pupil Empedocles of Acragas has survived, making Empedocles one of the most widely attested Pre-Socratic philosophers. A large number of fragments written by the philosophers Heraclitus of Ephesus and Democritus of Abdera have also survived. Of all the classical philosophers, however, Socrates, Plato, and Aristotle are generally considered the most important and influential. Socrates did not write any books himself and modern scholars debate whether or not Plato's portrayal of him is accurate. Some scholars contend that many of his ideas, or at least a