Can you only have one instance of certain summons?
	
			 
             
			
		
		
		
		As per, are (some) summons "single instance" (if so, how do you know)? 
 
I just summoned a second "Eater of The Dead" (in same province as first one, if that matters).  It happily took my gems, but says "Noone answered the spell", and I have just my original EoTD in existence.  Or, is it a chance thing, regardless of instances? 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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