"Timur's hair is thick and long, reddish-grey in colour, dark brown and red being the dominating shades...Timur's beard had been short and thick. It's hairs are rough, almost straight, and rather thick; their colour is red, with a great deal of grey."Apparently historical sources describe Timur as red-haired as well, but this had been thought incorrect as Timur is generally believed to have been Oriental/Mongolian. Incidentally Fomenko contests this, believing him to be European.
Now I'm going to read Christopher Marlowe's play 'Tamburlaine the Great' to see if red hair pops up in that. I've been meaning to read it for a while now but have never gotten round to it. This has inspired me.