"The Praetorian Gate was the main entrance to the City Of York (or Eboracum as it was then known) during Roman Times. The original construction date is uncertain but the gate was probably rebuilt around 300AD. It guarded the entrance to the Praetorium where Julius Agricola and Petillius Cerealis directed the Roman legions and where Constantine was acclaimed Emperor on the death, in York, of his father Constantius. The gate had two arches, each spanning a road approximately 20 feet wide..."
Historic York: A Guided Tour

The above images are front and back views of what is left of the Praetorian Gate in Aosta, Italy. However it appears similar to that of the description given to the gate from Eburacum. In York today, the gate used to stand partly across the square and partly across the large building inscribed 'Yorkshire Insurance Co.' in the city where I've actually located it on the setting map. The gate was the entrance to the Praetorium, or headquarters, of the Roman Legions that were based in Eburacum, and as such was an imposing edifice.

In 566AD, the Praetorian Gate is intact, but with the growth of the city over the last several hundred years (and the departure of the Romans), the walls adjoining the gate have been knocked down and the stone cannabalised for other masonry works. Buildings have subsequently been built over the remains, and the gate now stands solitary as the city bustles about it. The gate is now a popular meeting place in the city for the locals, particularly those who call themselves Romano-British.