Muses in Wikipedia

The Muses (Ancient Greek αἱ μοῦσαι, hai moũsai [1]: perhaps from the o-grade of the Proto-Indo-European root *men- "think"[2]) in Greek mythology, poetry, and literature are the goddesses or spirits who inspire the creation of literature and the arts. They were considered the source of the knowledge, related orally for centuries in the ancient culture, that was contained in poetic lyrics and myths. In Boeotia, the homeland of Hesiod, a tradition persisted[3] that the Muses had once been three in number. Diodorus Siculus, quotes Hesiod to the contrary, observing: Writers similarly disagree also concerning the number of the Muses; for some say that they are three, and others that they are nine, but the number nine has prevailed since it rests upon the authority of the most distinguished men, such as Homer and Hesiod and others like them.[4]...

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