alternatehistory.com

So basicly the title says it all, what was the earliest possible point at which the technology available would allow Europeans could cross the Atlantic and make it back again to tell the story (Non stop apart from stopping in America)? Now I know someone crossed the Atlantic in a boat that St Brendan supposedly had access to but I don't know how plausible that is. I'm aware there will be disagreement but sure what harm.:)
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