This is indeed a forgotten book, as far as I am concerned; I had never heard of it to my recollection in 50+ years of reading English literature, though its author is fairly well known for writing Travels in Arabia Deserta, which I have log owned/ Like Travels, it is written in Doughty's own odd version of pseudo-medieval English. I discovered it from reading Abercrombie's The Epic, which recommended it with reservations, saying the style was sometimes hard to follow. It concerns the wanderings of ancient tribes led by Brennus who did historically invade Greece etc., though this version includes an earth-mother goddess among other characters. I should think it might appeals to some modern neopagans, if they could get past the style. ( )