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Prudence Jones and Nigel Pennick’s A History of Pagan Europe was originally recommended to me years ago, and I pretty much just read it for the fun of it. When it popped up on the approved reading list for the ADF dedicant path, I realized it’d probably be a good time to give it a closer look. It’s a rather dense read (though still an enjoyable one), and, considering the subject matter, it takes a couple of passes to really absorb all of the information presented.
Jones and Pennick do an excellent job of connecting dots between disparate cultures, explaining each area’s stages of religious development in easy-to-understand terms. (The convergent evolution of the concept of sacred wells/trees/etc. between Mediterranean and Celtic cultures was especially interesting.) I particularly enjoyed the analysis of Celtic culture pre-Roman contact. There’s really a dearth of information available on this period — it seems like a lot of what we know is via the Roman conquest itself. Because of Rome’s relatively relaxed attitude toward outsider religions, many aspects of Celtic religion were preserved (albeit in an altered form) through syncretism with the dominant religion of Rome. The Druids disappeared. Their symbols, deities, and sacred sites, however, survived.
(Ultimately, it was this attitude that led to the persecution of monotheists — Rome didn’t particularly care what religion anyone was, so long as every citizen honored the ruler’s personal deity. It was believed that this helped preserve the state itself, and thus failing to do so was tantamount to treason.)
A History of Pagan Europe is a bit dry, as many books of this nature are, but it’s a book I find myself returning to now and then. There’s a lot to take in, and, as a Pagan, I feel that sources like this are important — simple, factual, without a lot of the editorializing you find in books geared toward a new-age or Pagan audience.