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 samples exceeded the safety value of 1 µg microcystin per gram. University professor Daniel Dietrich warned parents not to let children consume "A. flos-aquae" products, since children are even more vulnerable to toxic effects, due to lower body weight, and the continuous intake might lead to accumulation of toxins. Dietrich also warned against quackery schemes selling these cyanobacteria as medicine against illnesses such as attention deficit hyperactivity disorder, causing people to omit their regular drugs. A Canadian study studying the effect of "A. flos-aquae" on the immune and endocrine systems, as well as on general blood physiology, found that eating