York (Eboracum, Britannia) (lat/lon 53.962, -1.080) was founded in 71 AD. It was the northwest corner of the Roman Empire when the Seven Sages of Greece mosaic was buried in the Mt. Vesuvius eruption of 79 AD. At that time the Roman legions were moving up the island of Britannia and by 122 AD were building Hadrian’s wall eighty miles north of modern York.
York is in the top left of the map above and the green area of Britannia is where the Romans were in control in 54 AD.
Below is the Seven Sages mosaic picture with the image removed, leaving only the lines at 53.8° and the radiant lines from the sundial showing the hot spots of multiple crossovers for easier visualization of the relationships. Click the pictures for bigger images.
Note that the vertical center line for the mosaic departs from the top center gargoyle’s nose downward through the top sage’s eye, onto the center of the whole picture where the horizontal dividing line is met, down to the sage’s foot at a point that is a hot spot for other site line crossings; on to another foot that is also a site for other multiple line crossings and down to the bottom gargoyle’s nose.
The Seven Sages mosaic must have been created between the founding of Eboracum in 71 AD and the eruption of Vesuvius in 79 AD.