Question: What classical Greek philosopher credited as one of the founders of Western philosophy, was featured in the Socratic dialogue, The Symposium? 
Sentence (from "Symposium (Xenophon)"): In it, Socrates and a few of his companions attend a symposium (a lighthearted dinner party at which Greek aristocrats could have discussions and enjoy entertainment) hosted by Kallias for the young man Autolykos.
Relevant evidence: Yes