This article makes no mention that its subject, Gu, is mentioned in roughly 1000 B.C. in the Chinese classic: the I Ching. (one of 64 chapters is devoted to it) We are talking 1500 years older than the oldest sources referenced in this article. So, it very well may have existed, or if a 'legend', it was around for at least that long. You can look this up yourself, it is Hexagram 18. Food for thought.
is mentioned in roughly 1000 B.C. in the Chinese classic:
the I Ching. (one of 64 chapters is devoted to it) We are talking 1500 years older than the oldest sources referenced in this article. So, it very well may have existed, or if a 'legend', it was around for at least that long. You can look this up yourself, it is Hexagram 18. Food for thought.