[dtheodor]

If you are interested, I highly recommend the youtube channel Kings and Generals. It has very good history content on the last centuries of the Roman Empire and the rise of the Ottomans, among others.

Rise of the ottomans: https://www.youtube.com/watch?v=Xfb9fIMzuRw&list=PLaBYW76inb...

Fourth crusade and the restoration of the roman empire: https://www.youtube.com/watch?v=3Vp_IENiSnA&list=PLaBYW76inb...