Oh! 1453! Great year! Well, not for the Byzantines, or the French or English... but in terms of history, you humans should really be happy with this year. Fall of the Byzantine Empire leads to the Age of Discovery, which of course leads to the world we all know today. Not to mention the beginnings of the Renaissance, including a year after the birth of Leonardo DaVinci.
And the very early beginnings of the Ottoman Empire in what would become Turkey. Mehmet II, Sultan, bit of an angry sort. Played dice with him, may have also invented Draughts a century early. Well... the Draughts where you jump each other.
And Florence! Oh, that's even more brilliant. Might have to take a look around, though Florence really hasn't become what it eventually will yet. Bit sad there. And far too few baths... very smelly time. Smell of history!