The <a href="https://en.wikipedia.org/wiki/First_Vatican_Council" id="mwoQ" rel="mw:WikiLink" title="First Vatican Council">First Vatican Council</a> decrees the dogma of <a href="https://en.wikipedia.org/wiki/Papal_infallibility" id="mwog" rel="mw:WikiLink" title="Papal infallibility">papal infallibility</a>.