 Their weight and silver content can be compared with other reigns, providing a hint of the prevailing economic conditions, and the style and size may also throw light on cultural influences when the coins are compared with those of neighbouring kingdoms and with other forms of art.The evidence of Northumbrian coinage is particularly valuable in the ninth century, when contemporary written evidence all but disappears.From the 740s until the end of the Northumbrian kingdom, coins were issued by most kings, although in variable quantities.