I have no idea where to start as to which pubs are the oldest. The reason I say this is that most sites that claim to know this do not actually reference their data, including wikipaedia which appears to spout nonsense about Roman Taverns. It is therefore up the person writing the article to decide what is true, and what is a myth written by fairies.
I have been building pub history sites for some years, and I can confirm I have also copied data which is also entirely stupid, and this is why I like to check my references. A number of years ago i posted about the earliest pub being at Pompeii, and it could be dated as it was buried under the Vesuvius ashes. A number of sites have repeated this as being the pre-cursor to the early English pub? Seriously?
A quick note on the Roman tabernae, which actually appear to have been a Greek invention from 4th or 5th century BC. The Romans also invented the bible, although earlier claims are that it was originally from a bunch of scrolls of papyrus dug up on the western banks of the Dead sea!
A taberna was a shop or stall with some form of market trade. The plural tabernae related to different types of commerce which could exist and was not just in the wine trade, but more an early form of retail outlets serving any purpose.
The soldiers in a Roman army were tended towards drinking a substance called posca which was a mixture of water, a vinegar and herbs to improve the taste; whereas wine would be reserved for the better off classes, and again mixed with water. It is very doubtful that the Roman soldiers were actually allowed into any form of local bar, but drank whatever subsistence was allowed to them.
So most of the stories about the introduction of taverns by the Romans in AD43 are little more than fictional and unresearched fairy stories, a bit like reading Harry Potter (although I do like the Harry Potter novels).
Through time, the word tavern did eventually become synonymous with just a place for refreshment, initially including wine, food and sometimes lodging.
Inns appear to have been not just places for lodging, but also likely to have stabling or coaching facilities, and rooms around a courtyard.
The terminology describing a public house, which existed from the 17th century, was in referencing a house which was open to the public genreally, usually selling beer or cider, but not providing meals. It would also be self-service in having a bar, or counter, at which you stood, to order drinks and rather than being waited by a table service.
Before I continue, I get a regular feed from pinterest these days, and a very large number of the pictures originate from my pubwiki site, and some moron copies it into pinterest because they are too damned lazy to research anything properly, a bit like most of the websites which talk about pub history and their oldest pubs. Interesting, eh?
Back to the early pubs.
Or you could just visit all of them at the pubwiki ………..