" 
 ::::No, I think you're confusing what RGCorris has been saying with that of Freedom1968 (a scion of Essex University, perhaps?!). I think the point about Warwick's imprisonment RGC was making was the fact that when imprisoned, there were rarely records kept on them. The most common primary sources all of a sudden wouldn't apply; governemnt documents (wouldn't need to mention them), personal letters (possibly banned from sending or receiving them) and household accounts (well, you didn't have much of a household in the Tower!). And the only other common record of someone's life was so often their death- a record of their will being proven, or burial costs from somewhere. In other words- it is perfectly usual for there to be no positive record of a prisoner until his death. The question then, of course, is if the risoner didn't die- what record could have existed? Any I think that's what he means by 'existence confirmed by reliable historians'.  "