What are your interests? Do you like politics, art, science, any particular regions, etc? What is the course and level(are you in high school, college, etc)?

Well, I just read an interesting book, called Blood Royal, about the murder of the Duc D'Orleans, the brother of King Charles of France, in 1407, which affected French politics for the next several hundred years.

Or there's the Cathar religion of France, which is interesting as a social movement.

There are The Princes in the Tower--England's King Edward V and his brother the Duke of York.

If you like witchcraft, there's the book Malleus Maleficarum, which set off a whole bunch of witch hunts throughout Europe. Very influential as a social movement. It was basically a moral panic, a literal witch hunt, and bears resemblances to moral panics of today.

You could study the Gutenberg Bible and the first printing press.

Here's an interesting, early book: The Nuremberg Chronicle. One of the earliest books published in Europe, it's a history of the world as seen from the people of Nuremberg (so they emphasize how important they are).

If you like art: Hieronymus Bosch and his trippy work.

See, as a high school teacher myself , my instinct is to not help you because of the comment

Something he wont likely have hard about as much is ideal

because it looks like you're just trying to take the easy way out.

However, I will recommend Cesare Borgia. Famous enough that there's a lot of information out about him, but it's not yet another paper on Leonardo da Vinci. And he's interesting.