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Here's a rough map of the trade lanes/routes at the time of the POV character in 803

View attachment 376901

Edit: I'd like to note a few things. i tried to make the lines of the routes porportional to the volume of trade they see. So most of the Anglish 'nations' see relatively little trade, the exception being Lunden, as it's been developed more by Pendraigs and the ældarmenn of the city.

Ireland sees a lot of trade, the most common commodities being (unfortunately, but historically) slaves.

But Brythain is the powerhouse, Particularly the capital and chief port of Kaerloîu (aka Gloucester), and it's twin Kaerkorin (Cirencaster) which sits on the intersection of several Roman roads, most prominently the repaired Fôssy (fosse way)