Here are some one liners...
The Prince of Mass Movements -- Nicolo Machiavelli is captured and tortured after Florence is taken by the Medicis. He will decide to ingratiate himself to the new ruler by writing a book, "The Prince."
Balboa and the South Sea -- You knew it was coming. He will march 1,000 Indians across Panama and find what the Indians already know is there. He will name it the South Sea.
Florida Found... but No Fountain of Youth -- Ponce de Leon will land on the Florida shores. No fountain of youth though. That was a legend ascribed to him after his death.