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Some interesting points:
a) the boat design of the sunken Rhone barges seems to be very close to that of the barges used on the Rhine, which makes sense.
b) Arlelate had significant trade and even the floating bridge over the Rhone into the early 8th century, again reinforcing the notion that it was the Muslim conquests that severed the ancient Mediterranean trade routes
c)The ceremonial solid gold belt buckle seems to be an ancestral design for the ceremonial Migration Period buckles found in Childeric's tomb, Sutton Hoo, etc., minus the garnet cloisonne. Another Roman cultural practice and technology that persisted into the early 7th century until the gold source in the Western and then Eastern Roman Empire dried up.
This also suggests that these items were, in fact, manufactured inside the Roman Empire, which bolsters the theory that the Sutton Hoo items, found with Easterm Roman bronze caldera, were acquired in service to the Empire and not manufactured locally or in the Kingdom of the Franks.