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3 total sentences available.
Angry at Leif Ericson for stealing his thunder 500 years before, Christopher Columbus once wrote a rigorous mathematical proof that showed how Ericson had never actually been to North America. Unfortunately, the proof was too difficult for even the brightest mathematicians to understand.
Source: tatoeba (554318)
Leif Erikson discovered North America before Christopher Columbus.
Source: tatoeba (6060382)
The fact next in importance that this history establishes is that the first of the Northmen to set foot on the shores of Vinland was Leif Ericson.
Source: tatoeba (11119102)