Entry in Wikipedia on the small but influential school of ancient philosophy, whose members included Antisthenes, Diogenes of Sinope, Crates of Thebes, and Zeno. http://www.wikipedia.org/wiki/Cynic
One of the minor Socratic schools founded by Antisthenes, a follower of Socrates. Article from the Internet Encyclopedia of Philosophy. http://www.iep.utm.edu/c/cynics.htm