Yu the Great and Sun Wukong's Staff
This is my answer to the following reddit question:
Did the Ruyi Jingu Bang, as a tool used by Da Yu, exist before the novel?
Monkey's golden-hoop iron staff can be traced to the khakkhara and iron rod respectively used by his precursor in the 13th-century JTTW. The story doesn't mention anything about Yu the Great. The demi-god's connection to the staff is, as far as I know, unique to the standard 1592 edition of JTTW.
This association probably came about in a couple of ways. For example, there is a Chinese graphic similarity (and possible totemic connection) between Yu and a specific kind of monkey:
The generic Chinese primate names have identical pronunciations or spellings to those of the earliest Chinese emperors. For instance, the character 猱 (Nao) is considered as the ancestral name of the royal family of Shang dynasty (商朝 ca. 1600–1050 BCE) (Cao, 1997; Wang, 2001). This word is used to denote a primate species that is good at climbing. Similarly, the character 禺 (Yu) represents a long-tailed monkey. This word is the same as the character 禹 (Yu), a legendary emperor well known for his brilliance in regulating floodwater (Huang, 2011). This association between primates and the earliest emperors indicates a possible totemic status for primates (Niu, Ang, Xiao, et al., 2002, p. 91).
(The aforementioned Yu (禺) monkey was apparently well-known, for it is referenced several times in the Classic of Mountains and Seas (Shanhai jing, 山海經, c. 4th-century to 1st-century BCE), a popular Chinese bestiary, in order to indicate the shape and size of certain primate-like animals (Strassberg, 2002, pp. 83, 84, 91, 99, 104, 122, 123).)
Also, Yu is known for imprisoning Wuzhiqi (無支奇 / 巫支祇), a monkey flood demon, beneath a mountain in Tang and Song-era folklore. This likely influenced Sun Wukong's punishment under Five Elements Mountain.
Therefore, all of this probably led to the author-compiler of the 1592 JTTW associating Monkey's staff with Yu the Great and his efforts to end the world flood.
Sources:
Niu, K., Ang, A., Xiao, Z. et al. (2002). Is Yuan in China’s Three Gorges a Gibbon or a Langur? International Journal of Primatology, 43, 822–866. https://doi.org/10.1007/s10764-022-00302-1
Strassberg, R. (2002). A Chinese Bestiary: Strange Creatures from the Guideways Through Mountains and Seas. University of California Press.
