Xenophon, son of Gryllus, of the deme Erchia of Athens, was a soldier, mercenary and an admirer of Socrates. He is known for his writings on the history of his own times, the sayings of Socrates, and the life of Greece. Wikipedia
The definitive Wikipedia entry for Xenophon. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Xenophon