Battle of Baghdad
...that the Mongols, led by Genghis Khan's grandson Hulegu Khan, executed Al-Musta'sim, the Abbasid caliph of the Islamic state, following the 1258 Battle of Baghdad?
...that the <a href="./Mongols" id="mwrA" rel="mw:WikiLink" title="Mongols">Mongols</a>, led by <a href="./Genghis_Khan" id="mwrQ" rel="mw:WikiLink" title="Genghis Khan">Genghis Khan</a>'s grandson <a href="./Hulegu_Khan" id="mwrg" rel="mw:WikiLink" title="Hulegu Khan">Hulegu Khan</a>, executed <a href="./Al-Musta'sim" id="mwrw" rel="mw:WikiLink" title="Al-Musta'sim">Al-Musta'sim</a>, the <a class="mw-redirect" href="./Abbasid" id="mwsA" rel="mw:WikiLink" title="Abbasid">Abbasid</a> <a class="mw-redirect" href="./Caliph" id="mwsQ" rel="mw:WikiLink" title="Caliph">caliph</a> of the <a href="./Islam" id="mwsg" rel="mw:WikiLink" title="Islam">Islamic</a> state, following the <a href="./1258" id="mwsw" rel="mw:WikiLink" title="1258">1258</a> <b id="mwtA"><a class="mw-redirect" href="./Battle_of_Baghdad_(1258)" id="mwtQ" rel="mw:WikiLink" title="Battle of Baghdad (1258)">Battle of Baghdad</a></b>?