Because the Roman Emperor himself, Septimius Severus, came to Britain in 209 AD. Using two Roman forts as bases, Cramond and Carpow, Severus launched his invasion. To avoid destruction and total ...

Archaeologists working in England found a "mysterious lump" of a purple substance that in Roman times would have ... the Roman emperor at the time, Septimius Severus, had visited Carlisle.

He said: “It’s probably the first Tyrian purple found in the province of Britain ... He believes that it dates from the time ...