Guest Dave, whatever the thread title, we have all been discussing history for weeks now, except DtG obviously.

DtG, absolute proof is a requirement in Science. That is why evolution is referred to as a theory and not a law.
You are Pete's natural ally. You should be out there arguing his case that it is not and can not be proven.

In human affairs absolute proof is rarely possible.
You can be hanged if the case against you is just proven beyond reasonable doubt.

It is beyond reasonable doubt that if a group of historians existed, or even just one, churning out work that contradicted all those prominent historians quoted here, then we would have come across it or at least some reference to it.
The fact that none of us have proves beyond reasonable doubt that there is no such group.

Jump and gyrate on your pin Dave, but it is proven beyond reasonable doubt that the historians agree on those three points.
Go hang yourself.