<a href="https://en.wikipedia.org/wiki/Pope_Innocent_IV" id="mwMw" rel="mw:WikiLink" title="Pope Innocent IV">Pope Innocent IV</a> issues the <a href="https://en.wikipedia.org/wiki/Papal_bull" id="mwNA" rel="mw:WikiLink" title="Papal bull">papal bull</a> <i id="mwNQ"><a href="https://en.wikipedia.org/wiki/Ad_extirpanda" id="mwNg" rel="mw:WikiLink" title="Ad extirpanda">ad extirpanda</a></i>, which authorizes, but also limits, the torture of <a href="https://en.wikipedia.org/wiki/Heresy_in_Christianity" id="mwNw" rel="mw:WikiLink" title="Heresy in Christianity">heretics</a> in the <a href="https://en.wikipedia.org/wiki/Medieval_Inquisition" id="mwOA" rel="mw:WikiLink" title="Medieval Inquisition">Medieval Inquisition</a>.