In which century was Hadrian's Wall built in Northern England?

Hadrian's Wall, known as 'Vallum Hadriani' in Latin, is a stone fortification built across northern Great Britain by the Roman Empire in the early second century. The Roman emperor Hadrian (AD 76-138) requested the wall to keep barbarians (northern Britons) out of the Roman territory. The wall runs between the Solway Firth and the River Tyne and marked the northern border of the Roman Empire.

The construction of the wall took place between 122 and 126 AD. It spanned 118 kilometres (73 miles) and was predominantly made of stone, although some parts were made from turf instead. The stone parts were 3 metres (9.8 feet) thick and 4.2 metres (14 feet) tall, but the turf section was thicker: 6 metres (20 feet).

The wall was the most heavily fortified border in the Roman Empire. It had several gates, which served as customs posts to allow trade and levy taxation.

Hadrian's Wall was made a UNESCO (United Nations Educational, Scientific and Cultural Organization) World Heritage Site in 1987. A significant portion of the wall still exists, particularly the midsection, but some of the wall has disintegrated over time. The length of the wall can be followed on foot by Hadrian's Wall Path, but visitors are told not to walk on the wall itself, both for their safety and to protect the ancient stone.