Full Idea
The fact that Queen Anne has been dead for some years is not, in the strict sense of 'about', a fact about Queen Anne; it is not a fact about anyone or anything - it is a general fact.
Gist of Idea
That Queen Anne is dead is a 'general fact', not a fact about Queen Anne
Source
Arthur N. Prior (Changes in Events and Changes in Things [1968], p.13), quoted by Robin Le Poidevin - Past, Present and Future of Debate about Tense 1 b
Book Reference
'Questions of Time and Tense', ed/tr. Le Poidevin,R [OUP 2002], p.21
A Reaction
He distinguishes 'general facts' (states of affairs, I think) from 'individual facts', involving some specific object. General facts seem to be what are expressed by negative existential truths, such as 'there is no Loch Ness Monster'. Useful.