Much examined, not yet solved is the puzzle of the placename ‘Traiectus’, referred to in the Antonine Itinerary of the 2-3rd century. In the section on Britannia, Itinerary XIV starts at Isca (Silurum), or Caerleon, and ends at Calleva (Atrebatum) – Silchester.
Most of the stations along the way have been identified, with more or less certainty; but very roughly fourteen miles on from Sea Mills (Abone) and six miles short of Bath (Aquis Solis) is the mysterious ‘Traiectus’. The figures xiiii and vi mean 14,000 passus and 6,000 passus. Given the modern computation of a passus, that would be roughly 13 miles from Sea Mills and 5 1/2 from Bath. The common view is that it coincides most closely with Bitton, on a stretch of the old Roman road between Bath and Hanham on the outskirts of Bristol. The distances match closely enough, but it remains the least certain of the identifications of this Iter.
So, why would it not be? Well, firstly, a traiectus is a crossing, so the argument is that this could be the River Boyd. If so, it must have been a bigger river than it is now – by some considerable margin.
At present it looks like the kind of small waterway which might or might not have needed a stone ford. Wheeled carts or wagons could splash in and out the other side, hardly noticing it. To designate the place ‘Traiectus’ would be to dignify it beyond its obvious desserts.
After leaving Sea Mills and before arriving at Bitton, the traveller would also have to cross the River Frome, not the widest river in all Britain, but this is still (at the present time, it must always be remembered) only the size of river that could be easily forded, without even the need of a bridge.
Traiecti must have been ten a penny if river crossings the size of that over the Boyd merited the name.
The other point is that Bitton has no very strong Roman connections. A nearby camp, once considered to have been Roman, seems more likely to have been medieval and there are no more than a few odds and ends in the way of Roman remains. So for the Romans, the most notable aspect of Bitton would have been – its river crossing …
On the other hand, more puzzling than that, the Itinerary as it survives makes no mention of the fact that to get from Caerwent to Sea Mills a rather wider stretch of water must be crossed than the River Boyd. An alternative suggestion for Traiectus is that it referred to the crossing of the Severn Estuary itself. Can that be supported?