When was Charlemagne born?

To exercise my mind I read the writings of James Altucher This morning he wrote about doing more with less. And he talked about only learning about stuff when you were interested to learn about stuff - and he gave an example about history. Here is what he said: “If you try to teach people with no interest, they won't learn. To this day, at every conference I speak at, nobody can tell me the birthdate of Charlemagne within 500 years. Go ahead, guess right now! “ I don’t know about you but I had no idea who Charlemagne was?? But the challenge meant I now do, and within 500 years I know when he was born. But I will probably wioe that information from my brain as I don’t think, apart from writing this article it will be of any use to me... #UselessCrap @James Altucher #WayneMansfield