Irene Palaiologina
... that Irene Palaiologina, the elder sister of Byzantine emperor Michael VIII Palaiologos, became a staunch opponent of his proposed union of the churches, and tried to form a Bulgarian–Mamluk alliance against him?
... that <b id="mwA5E"><a href="./Irene_Komnene_Palaiologina" id="mwA5I" rel="mw:WikiLink" title="Irene Komnene Palaiologina">Irene Palaiologina</a></b>, the elder sister of <a href="./Byzantine_Empire" id="mwA5M" rel="mw:WikiLink" title="Byzantine Empire">Byzantine</a> emperor <a href="./Michael_VIII_Palaiologos" id="mwA5Q" rel="mw:WikiLink" title="Michael VIII Palaiologos">Michael VIII Palaiologos</a>, became a staunch opponent of <a href="./Second_Council_of_Lyon" id="mwA5U" rel="mw:WikiLink" title="Second Council of Lyon">his proposed union of the churches</a>, and tried to form a <a href="./Second_Bulgarian_Empire" id="mwA5Y" rel="mw:WikiLink" title="Second Bulgarian Empire">Bulgarian</a>–<a class="mw-redirect" href="./Mamluk_Sultanate_(Cairo)" id="mwA5c" rel="mw:WikiLink" title="Mamluk Sultanate (Cairo)">Mamluk</a> alliance against him?