Sudbrook, Monmouthshire the Silures from the 2nd century BC and occupied by the Romans from the 1st century AD until the 4th century. The hillfort was originally much bigger than now having been eroded over the centuries. Finds of Roman coins at Black Rock, Portskewett, show that the ferry crossing was in use in Roman times, on the route between the Roman stations of "Aquae Sulis" (Bath) and "Venta Silurum" (Caerwent). According to tradition, Caradog Freichfras, the Welsh ruler of Gwent in the 5th century or 6th century AD, moved his court from Caerwent to the Portskewett area, possibly to the fort.
Aphanizomenon flos-aquae (dietary supplement) therefore not suitable for use as a B source for humans. "Aphanizomenon flos-aquae" contains minerals and trace minerals (including calcium, chloride, chromium, copper, iron, magnesium, manganese, phosphorus, sodium, and zinc). Whether or not AFA microalgae contain a balance of bioavailable minerals and trace minerals depends on the mineral content of their growth environment. AFA" "is approximately 60% protein by dry weight. Approximately 45% of the lipids (fats) of AFA are essential fatty acids. "Aphanizomenon flos-aquae" contains a balance of both linoleic acid (LA, an omega-6 fatty acid) and alpha-linolenic acid (ALA, an omega-3 fatty acid). Researchers at Massachusetts General Hospital