After the Romans left Britain, the many towns set up by the Romans were abandoned and crumbled away as the new settler, Anglo-Saxons people went back to living in the countryside because they were farmers and build new kingdoms.
However, some Roman towns continued to exist and still exist today, which indicates the rich culture of the Romans.
Some things involved were......fish, lumber, tobacco, iron products, flour, and meat
They were treated terribly often beaten and raped as well as tortured and murdered.