Well, I don't make the rules, I just nitpick. 
But, having said that, I might be hoist by my own petard, as there is a conflict in this regard. I probably learned the British Version, the American Version is probably "A historian"
EDIT: And I certainly didn't use commans properly or sparingly in the above sentence!
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		| Imperator Fyron said: 
 
	That is not correct... unless you don't ever pronounce the "h"? Would you say "an hat" or "an house?" I sure hope not...Quote: 
	
		| alarikf said: I applaud your grammatically correct use of "an" in front of "historian"
 
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