Milecastle 21

Hunnum (also known as Onnum, and with the modern name of Halton Chesters) was a Roman fort on Hadrian's Wall located north of the modern-day village of Halton, Northumberland in North East England. It was the fifth fort on Hadrian's Wall and is situated about 7.5 miles west of Vindobala fort, 5.9 miles east of Chesters fort and 2.5 miles north of the Stanegate fort of Coria (Corbridge). The site of the fort is bisected by the B6318 Military Road, which runs along the route of the wall at that point. The fort may also have guarded Dere Street which crosses the Roman Wall through the valley immediately to the west, but its distance from Dere Street and that Milecastle 22 was also displaced from Dere Street implies that this was not a priority and may have been expected to be disused north of the Wall after Hadrian's Wall was built.The Latinised Brittonic name “Onnum” may mean "Stream/Water", "Ash tree", or “Rock”; if it means "Stream", it may be a reference to the Fence Burn, where a stream touches the line of Hadrian's Wall, but if it means "Rock", it may refer to Down Hill situated to the east of it.

Halton is a village and former civil parish, now in the parish of Whittington, in the southern part of Northumberland, England. It is situated 3 miles (4.8 km) north of Corbridge just south of Hadrian's Wall. In 1951 the parish had a population of 24.Halton Castle is a pele tower and grade I listed building.

Halton Castle is a pele tower and grade I listed building situated close to Hadrian's Wall to the north of the village of Corbridge in Northumberland, England. The tower was first recorded in 1382 and it is still present today. It has four storeys and a basement with a stone vault. In the 15th century a manor house was built onto the north side of the tower giving it a T-shaped plan. In about 1696 much of this building was demolished by the then owner John Douglas and replaced with the present five-bay residence. In 1757 Anne Douglas the heiress of Halton married Sir Edward Blackett and the castle remains a residence of the Blackett family.

Great Whittington is a village and former civil parish, now in the parish of Whittington, in Northumberland, England, 7 miles NE of Hexham. In 1951 the parish had a population of 158.

Aydon Castle, previously sometimes called Aydon Hall, is a fortified manor house at Aydon near to the town of Corbridge, Northumberland, England. It is a Scheduled Ancient Monument, and is designated by English Heritage as a Grade I listed building.

Milecastle 20 (Halton Shields) was one of the milecastles on Hadrian's Wall (grid reference NZ01886868). It is situated in the hamlet of Halton Shields, and was excavated in 1935. There is no visible trace of the milecastle above ground.

Milecastle 22 (Portgate) was a milecastle of the Roman Hadrian's Wall. Its remains exist as a low, turf covered platform just east of the Portgate roundabout (junction of the A68 and B6318). The platform is 0.5 metres (1.6 ft) on the east side, reducing to only a parch mark on the west side.

Aydon is a village and former civil parish, now in the parish of Corbridge, in Northumberland, England. It is about 2 miles (3 km) northeast of Corbridge on the B6321 road. The village is about 18 miles (29 km) from Newcastle upon Tyne along the main A69 road. The A68 road is close by, leading to Jedburgh and Darlington. Aydon lies near the course of the ancient Roman monument, Hadrian's Wall. In 1951 the parish had a population of 90.

The Portgate was a fortified gateway, constructed as part of Hadrian's Wall where it crossed the Roman road now known as Dere Street, which preceded Hadrian's Wall by around 50 years. It was built to control traffic along Dere Street as it passed north through Hadrian's Wall. The gate's remains exist beneath the old B6318 Military Road to the south-west of the Stagshaw Roundabout (the B6318 was diverted slightly for the construction of the Stagshaw Roundabout, leaving two short sections of the existing road unlinked – the remains of the Portgate are buried beneath the western section).

Corbridge is a village in Northumberland, England, 16 miles (26 km) west of Newcastle and 4 miles (6 km) east of Hexham. Villages nearby include Halton, Acomb, Aydon and Sandhoe.

Corbridge Town Hall is a municipal building in Princes Street in Corbridge, Northumberland, England. The building, which is now in commercial use, is a Grade II listed building.

The Battle of Corbridge took place on the banks of the River Tyne near the village of Corbridge in Northumberland in the year 918. The battle was referenced in the Annals of Ulster and the Chronicle of the Kings of Alba. The battle was fought between Norse-Gael leader Ragnall ua Ímair and his allies against the forces of Constantín mac Áeda, King of Scotland together with those of Ealdred I of Bamburgh who had previously been driven from his lands by Ragnall. The Historia de Sancto Cuthberto adds that English fought alongside Norsemen. The Annals of Ulster informs us that the Norse army divided itself into four columns, in one of which may have been Jarl Ottir Iarla, a long-time ally of Ragnall.The Scots destroyed the first three columns, but were ambushed by the last. This unit had remained hidden behind a hill and was commanded by Ragnall. The Scots, however, managed to escape without disaster. It seems that it was an indecisive engagement, although it did allow Ragnall to further establish himself in Northumbria. In 919, Ragnall descended on York where he took the city and had himself proclaimed king. The Bernicians remained under him, although Ealdred I of Bamburgh and Domnall I, king of Strathclyde, paid homage to the king of England.In 1950, F. T. Wainwright argued that there were two battles of Corbridge in 914 and 918, and his view was widely accepted for over fifty years, but since around 2006 historians have taken the view that there was only one battle in 918.