The northernmost province of the Roman empire at its height was Britannia. It is modern day Britain and Ireland.

The northern border of the Roman province of Britannia was Hadrian's Wall.

Brianna the Latin name for the Roman province of Britannia, which covered England and Wales. Scotland was called Caledonia.

Britannia became a Roman province officially in 43 AD.

Hadrian's Wall was built to protect the Roman province of Britannia, not Rome which was (and still is) about 1,140 miles from the area of this wall . not Rome. This province was part of the Roman Empire