March 17th St Patrick's Day St Patrick was an evangelist and died about 461AD. In his book Confessions, St Patrick said he came from Bannaventarbernia and his father worked on the wall.
Banna is Birdoswald (near Brampton on Hadrians Wall). We know this because a Roman carved stone was dug up in the area with the word Banna on it.
The stone is in Lanercost Priory, near Brampton.
Vent means loophole in embattled wall, allowing passage out of,
outlet to, going to. There is such a vent (where a stream runs
through the wall) between Birdoswald and Irthington, but also the meaning "going to" is relevant. Arbeia was a prominent Roman site overlooking and protecting the Tyne Estuary and a prominent military supply base for Wall. The pay chests would be delivered to Arebeia and it was the lifeline to the rest of the Wall.
St Patrick would describe his homeplace as Banna (Birdoswald) Vent (going to) Arbeia (by Tynemouth). Roman fortifications extended to Maryport which is exactly opposite to where St Patrick was taken captive to, on Mount Slemish, Ireland.
Info supplied by M. S. Quinn, Frizington.
[link to bound-together.org.uk]

... since his father was both a cleric and a Roman official in Britain, maybe scholars who think the future saint was born near the Birdoswald section of Hadrian's Wall are right.
[link to www.awesomestories.com]

Birdoswald has the best preserved defences of any of the 16 major forts which supported Hadrian's frontier system. Known to the Romans as 'Banna', from the early 3rd century its garrison was a thousand-strong infantry unit originating in Dacia (modern Romania). Three main gates of their fortress are still traceable, along with perimeter walls, angle towers, granaries and an unusual drill hall.
[link to www.britevents.com]