Crick, Monmouthshire an important junction on the Roman road sometimes known as the "Via Julia" which ran from Bath ("Aquae Sulis") across the Severn estuary to Sudbrook and on to Caerwent ("Venta Silurum") and Caerleon ("Isca Augusta"), now in Wales. At Crick the route met the roads to Gloucester ("Glevum") and Monmouth ("Blestium"). There is also evidence of an early Norman motte and bailey castle at Ballan Moor near Crick, probably built by the Ballon family in the late 11th or early 12th century. In July 1645, during the English Civil War, a mediaeval hall at Crick was the site of a
Aphanizomenon flos-aquae (dietary supplement) from the air, and water to synthesize proteins, carbohydrates, and lipids. AFA is also able to directly use molecular nitrogen from the air to produce proteins and other nitrogen-containing biomolecules. This ability is widespread in prokaryotes, but unknown in eukaryotes. "Aphanizomenon flos-aquae" as a species has both toxic and non-toxic forms. While benefits have been indicated, toxicity has been shown in some strains of the species "Aphanizomenon flos-aquae", with cylindrospermopsin and saxitoxins present, and microcystins found contaminating AFA dietary supplements. The World Health Organization's "Guidelines For Drinking Water Quality" note Anatoxin-a, saxitoxins, and cylindrospermopsins are present in the Aphanizomenon genus.