Why was Hadrian's Wall built?

Hadrian’s Wall was built on the orders of the Emperor Hadrian
to strengthen the British frontier of the Roman Empire from AD 122. Myth has it that Hadrian's Wall was built to keep out Scottish Barbarians that were a threat to the Roman Empire and unripe for conquering. Ask locals in the Northumbrian market town of Hexham and Northumbrians will tell you that in fact Hadrian's Wall was built to keep out the ancestors of the Border Reivers from the North Tyne valley the Scottish Border counties.

It took the Roman legionaries, who built the Wall, about 6 years to complete the job. Hadrian’s Wall was built across one of the narrowest parts of the country linking two rivers. When it was finished the Wall was 117km or 73 miles long. Hadrian's Wall stretched from Wallsend on the river Tyne in the east to Bowness on Solway in the west.

Other questions frequently asked about Hadrians Wall include:

What is the history of Hadrians Wall?

Where can i find a map of Hadrians Wall?

When was Hadrians Wall built?

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Where is Hadrians Wall?

Why was Hadrians Wall built?