Nothing in known of 宋元君 Sòng Yuán Jūn, "Lord Yuan of Song," outside of Zhuangzi. He appears twice in our collection, in Zhuangzi's story about the Plaster Monkey at Huizi's grave (9:13) and hiring a naked cartographer in 11:08. He may be the same as Duke Yuan of Song (especially since 11:08 refers to him both as君 jūn "Lord" and 公 gōng, "Duke"), who reigned 531–517 B.C. If so, there is nothing notable about him I can find, so it is not clear to me what Zhuangzi would have meant by placing him in these stories.