Don't go schooling me on Catholic history just yet...
Meanwhile, here are some more errors to denounce.
Oh, that's rich. I'm so persuaded. Perhaps now would be a good time to talk about Pope Leo IX and his use of what is arguably the most notorious forgery in history.
http://www.newadvent.org/cathen/05118a.htm
On second thought, let's not and say we did.
What's your point? That the citations I linked are forgeries? Sorry, I don't believe they are, but feel free to present your evidence.
My point is that the "denunciation" of "errors" your priest gave you might well serve to denounce a number of Eastern saints and patriarchs.