You're projecting modern standards of safety and reliability into a millennium in which they do not belong. Nobody is gonna sail a warship with a huge expensiv

You're projecting modern standards of safety and reliability into a millennium in which they do not belong. Nobody is gonna sail a warship with a huge expensive crew across the ocean without a damn good reason. Such reason almost certainly never materialized, that's a given. But local mediteranean cargo vessels are more than seaworthy enough to cross the Atlantic in the same way that I can haul 3000lb in a Ford Ranger. Water and navigation will be your issues. The capability to get it done with not that much luck needed is there. I can't think of is why someone would both have the requisite provisions and a reason to sail west for weeks on end other than a "Skydiving From Space, Brought to you by Red Bull(TM) " style vanity project. And the economic surpluses at the time simply weren't large enough to support a lot of that kind of activity so it's doubtful anyone would have done it.