What do I say to Napoleon?

Hint 1 of 11:

You'll have to show him something to convince him to go to Cairo.

Hint 2 of 11:

Napoleon is a big fan of Charlemagne.

Hint 3 of 11:

He might go if he knew there was something waiting for him in Cairo.

Hint 4 of 11:

Something of Charlemagne's would be good.

Hint 5 of 11:

It also happens that the something is a royal gift.

Hint 6 of 11:

Tut has been waiting for a royal gift in Cairo, 1361 BC.

Hint 7 of 11:

Give him Charlemagne's crown.  (See Rome, 800 AD for more help.)

Hint 8 of 11:

Have you tried retrieving the crown in the future?

Hint 9 of 11:

Go to Cairo, 1215 AD to get it.