If you 1. are in bed, not sleepy at all, and you need some video on youtube to help you; 2. enjoy history; 3. don't enjoy history, but you think that you would enjoy it if it were explained better; 4. have nothing to do but to give a chance to a youtube channel than you should watch these guys . They have many videos filled with information about interesting rulers from history and their battles (Vlad the Impaller, Hannibal, etc.). What's even more impressive is their graphics which makes their content just too good. I suggest you give them a chance! More stuff related to this: Clasical paintings in selfies.