I have a backlog of things from Caerleon to post … we will get to them. For now, though, this seems to be the most important find … from the Guardian:
Archaeologists have discovered only the second known port of Roman Britain, where soldiers would have arrived in numbers from the Mediterranean to aid in the fight against some of the most stubborn and hostile of all the tribes they had to face.
Over the last year, archaeologists have been digging near the Roman fortress of Caerleon, just north of Newport, south Wales, and have made some remarkable discoveries. On Tuesday, the site was declared the only known Roman British port outside London.
“It is extremely exciting,” Peter Guest, leading the excavation team from Cardiff University, said. “What we have found exceeds all expectations. It now seems clear that we’re looking at a new addition to our knowledge of Roman Britain.”
Guest said the archaeologists had discovered far more than a quayside or harbour installation, adding: “It seems to be a deliberately founded and made port structure that goes with the legionary fortress in Caerleon.”
The remains are incredibly well-preserved, partly because the land has been used for grazing for so long and has not been intensively ploughed.
Archaeologists digging on the banks of the River Usk have found the main quay wall as well as landing stages, wharves and dockside tracks.
The port would have been for the fortress, the farthest flung of all Roman outposts and the place where, some believe, Arthur later convened his Camelot court. The fortress was constructed in AD74-75 as the military headquarters of the second Augustan Legion, one of four legions that invaded Britain during the reign of the emperor Claudius.
Having a port on the River Usk would have made it far easier to supply the frontline than “traipse over mile after mile after mile of bumpy Roman road”, Guest said.
Two thousand years ago, the locals in the area were the Silures, a tribe of ancient Britons who managed to keep the Romans at bay for a generation.
The Romans had a tricky time in south Wales, with the senator and historian Tacitus noting how fearsome, warlike and difficult to subdue the Welsh tribes were. He described a struggle of nearly 30 years in which the locals skirmished and avoided full-on battle before they were finally pacified.
The port discovery tops a list of amazing finds made during the excavation of a suburb of large public buildings over the last year, with bath-houses, marketplaces and temples all having been unearthed.
The dig ends on 1 September, and the area is open to the public until then.
… which reminds me of a joke which Jonathan Yardley (one of my professors at the University of Calgary) told on at least two occasions while we were doing Wheelock and/or Virgil (a variation on the one found here):
The Roman decided to invade Wales, the army had just crossed the border and came to the first forest when they heard a voice shout “One Welshman is worth two Romans”.
The army commander couldn’t resist the challenge and promptly sent two men into the forrest. After 10 minutes the voice shouted “One Welshman is worth ten Romans”.
The army commander again couldn’t resist the challenge and promptly sent ten men into the forrest. After 10 minutes the voice again shouted “One Welshman is worth 100 Romans”.
The army commander was now getting angry and sent two hundred men into the forrest. After 10 minutes the voice shouted “One Welshman is worth a Roman cohort”.
The army commander now really angry sent in one of his regiments. After 10 minutes one of the Romans emerged from the forrest bleeding and dying, and with his last breath he told the army commander…
“it’s a trap!.. there’s TWO of them in there!
rogueclassicism 
It seems to me to be a bit inaccurate to describe this as the second known Roman port when it is quite clear there was another besides Londinium: Portus Dubris (Dover in modern terms).
Whilst cleaning and expanding the cellar of the house I owned there, we found that the 19th century walls were built on top of the medaeival walls of a part of the Priory of St Martin, which in turn we build on top of the walls of Roman villa, which had a very presentable mosaic floor. It made a nice wine cellar. I doubt that there is much left of Roman port structures as the town has been built and rebuilt often and thickly, aside from being bombed heavily in the last war with the Germans.