If someone sues me for defamation and I'm spoken guilty. And when I might even have been prisoned for it, if this would change something, and after my punishment past it is figgured out that I was right.

Would this afterwards change something?

Would it be still defamation if I asumed I'm defamating the person but unkowingly told the truth?

And in both cases: Would I be able to sue that person for defamation? As the person knowingly defamated my reputation by suing me for performing defamation.

Suppose someone sues me for defamation and I'm pronounced guilty, and I serve time in prison. Then after my sentence is complete it is discovered that the defamatory statement I made was true?

Am I guilty of defamation if I make statements that I don't know are true, but which are true?

And in both cases: If I am accused of defamation and my statements are found to be true, is my accuser himself guilty of defamation?