I still can't find a Mount Silva in Somerset, only the Dorset one, and not many mentions of that. I did find this, also in the Proceedings of the Dorset Natural History and Archaeological Society": "There is one place which still retains its Roman name. It is the woody height of Mount Silva in Buckland Newton."
I had been hoping to find something saying it was more commonly known as ... whatever. Anyway, it's the only Mount Silva I can find. I'm sure I've come across confusion between Dorset and Somerset in a few census entries before.
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