I'll have be a contrary voice and say that while some tales of Classical myth are interesting, namely the Illiad, Odyssey, and material dealing with Heracles, overall I find the Classical mythology by far the most boring. While strong on detail it is weak in other areas, such as lacking as strongly a preserved cosmology and eschatology one finds in Norse myths with its World Tree, Nine Worlds, Ragnarok, etc. for example. IMO there is also no figure in Classical myth as intriguing as the multifaceted seeker of knowledge, master of magic and death, as Odin, as exemplified in his various epithets found here:
https://en.wikipedia.org/wiki/List_of_names_of_Odin
Celtic mythology is weakest in terms of detail regarding specific deities, lacks a creation myth, etc. but as I hinted at earlier those with even the slightest interest in mystical or esoteric topics will be able to discern that the Celtic myths were most advanced in this regard. The "gnosis" or omniscience of the bard-seer Taliesin I quoted earlier is an example, but really it's all about the Otherworld:
For a more advanced detail of the same topic:
https://www.jstor.org/stable/2055718...n_tab_contents
In Indo-European society the priestly caste of Brahmins/Druids and the sages were the highest caste and Celtic mythology comes closest to approaching the ideals of this caste out of the various European mythologies, with elements of Odin in the Norse myths and perhaps material in the Kalevala relating to Väinämöinen being second closest. Even to this day Merlin or his Tolkien equivalent of Gandalf remain the archetypal image of the Western/European wizard or pagan seer.
Furthermore Celtic myth reigns supreme in terms of living potency in the historical period. Even before Christianization the Classical gods and myths were often rationalized and humanized, becoming mere literary motif, whereas in its Frenchified form the Celtic Arthurian cycle was an animating power of the medieval period, with many kings and knights aspiring to be like Arthur and the Grail cycle becoming an inspired esoteric spiritual mythos...read Evola's "The Mystery of the Grail" to learn more.
On a more localized scale, the Gaelic mythological worldview remained a strong lived experience well into the modern period. The successor to the pagan druids, the filid, survived until the time of Cromwell and into the 20th century there are tales of contact with the Sidhe, say for example the many musical tunes purported to be of "fairy" origin. No other mythological culture can compare to the Irish in terms of a mythological topography that one finds in the Dindsenchas or the importance given to sacred geography with the sacred center or omphalos of Tara/Uisneach.
In short, outside of literary and artistic motifs, the power of Classical or even Norse mythology can't compete with the lasting power Celtic pagan myth has had as a living reality and never did they impose themselves so strongly on foreign people as Celtic myth managed to with the Arthurian cycle.
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