[pgkdan]

Who cares? Whether you make a case for the Irish St Brendan and his brother monks or the Vikings or the Chinese...or even the ancient Phoeniceans, it makes no difference. Christopher Columbus was the only one who went back and told everybody what he found. He'll always get the nod from me. (It frosts my Knights of Columbus butt anytime someone tries to steal his glory)

[Ruy Dias de Bivar]

Back in the early 1960's I had a book titled THEY ALL DISCOVERED AMERICA. I don't remember the author's name. It was about the various explorers of the ancient past who found the American continent way before Columbus.
In the late 1960's another book was written claiming that America was discovered by---the lost Asian fleet of Alexander the Great.