Question

What did Lief Ericson do around 1000 CE?

He settled the Vikings on the French coast in the area now known as Normandy.
He started a quarrel with the church in Rome that resulted in his excommunication for heresy.
He sailed with a group of Vikings to Newfoundland in Canada.
He wrote the Song of Roland, which celebrated the chivalry of the knights.

Answer 1

The best option from the list would be that "He sailed with a group of Vikings to Newfoundland in Canada," since he is considered by many to have discovered North America before Columbus.