I did state that Charlemagne would probably be a bit early in this instance but I'm talking rough dates here. Very rough. The further back we go the harder it is to pinpoint anyone important without fudging the dates a bit.
Charlemagne and Genghis Khan sit on different sides of the 1000 year line though, so it isn't that extreme. We're talking around 200 or 250 years each side. Which is for sure extreme when you consider the length of a single generation, but it's close enough.
I guess if we are talking exactly 1000 years with a variance for the average life span I can really only think of William and Cnut.