Notably, all of the baltics, western europe save the Med. They also have a full stack (I'm basing this off a RTW game) of Large Boats blockading the straits of Gibralter.
They settle the island and turn it into a major naval base, with which to rebuild ships.
Game Backstory:
Started in 262BC and got trade agreements with everybody, even the Numidians in 240. Greeks (?!?!) a year later. My diplomats crossed all of Europe and back. In 246BC I went to war over my European province. It was a long 60 years of seting up a fort just to the west. (See:
http://steamcommunity.com/id/Mopeyennui/screenshot/560902699816580215?tab=public) As you can see, to keep initial devastation from attacking the settlement, I set up a fort to take attacks from the Germans (although the pic wa taken when I had a temporary peace.)
I was allied with the Julii, for they would not trade without a alliance. Bad mistake, they took in the Gauls in 180, and the western Germanics too. Problem is I was happy the Germans were gone, but the Romans took the city - I couldn't get forces to escape. I panicked, and built up a navy of Large Boats, and three per fleet. Each fleet blockaded a port near me, and I kept building them. In 225 I blockaded the Baltics fully, and soon after I blockaded the former Gauls. A few years later the Spanish, and a decade further, I blockaded the Pillars of Herakles.
The blockade doesn't stop - I'm up to 107 AD. Also, I got over half a million gold (in RTW terms, suffice it to say, I'm bloody wealthy.)
What long term effects does this have - what would survive until modern day? What would the long term effects of Europe be of being such blockaded?
Each port gets three Large Boats in it's blockade fleet, the Med gets a intermittant 9 or 12 boats, but this fluxuates with the ever battling Piratical forces in the region. (Damn gnats! It's like a second Roman Navy.) Occasional Julii ships appear for no discernable reason (...I don't know why... I do blockade the Med...) in the waters surrounding Europe. The baltics stay quiet save occasional Piratical activity.
I'm asking for what myths and legends and local records would survive for archeologists in the future to find. Also speculate on the Britannic effects as well. (Bored of the game. Want something to think about as I coast until the end of the game. (Yes I'm going to pay for a mod so I can continue this in BI. It's kinda amusing. - I also want to see if I can see what happens!)