Roman Fleet stranded on the shores of the New World massive Storm

Actually, there is evidence to suggest that there was an, albeit brief, Roman presence in Ireland:
https://en.wikipedia.org/wiki/Gnaeus_Julius_Agricola#Agricola_in_Ireland?
Think people are confusing Roman Empire and Romans , the most the Roman Empire may have done is acted as mercenaries for a local ruler or counter raided after excessive piracy , some of the sagas refer to wizards leading followers in a way that could be a memory of drilled troops volleying javelins. However Roman traders were in Ireland constantly during the period.
As people have said the problem is that unlike Norway, Ireland was mainly empty , if people wanted land they did not have to try and find it across a sea. With no need to explore they did not , the vessels they used were simple galleys. The problem with boats like the Veneti used was their relative weight and draft. They were sturdy but better at using harbors and known waters than simple beaches and uncharted currents. Ok if you had settled lands, not so good for exploring.
Problem is any large Roman force could not have enough water let alone food to cross the Atlantic, 3 months was not unknown even as late as the 19th Century ( going West is the slow way as you are against the prevailing winds ). I've not heard of any voyages with legs of more than a couple of weeks between landfalls by the Romans and they were cargo vessels with maybe 6 man crews. They followed the coast or island hopped normally as despite some good tools they had not really mastered open water navigation.
Records of them crossing the channel make it clear the ships in use were better suited to the Mediterranean than the North Sea ( the masters were terrified of any sort of blow ). They seem to have been quite small, 30-75t of cargo at most rather than the larger vessels used in the Mediterranean, probably due to sea worthiness given the larger ships construction gave them relatively weak backs.
 
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