Euthymius I
... that Euthymius I became Patriarch of Constantinople because his predecessor, Nicholas Mystikos, refused to sanction Emperor Leo VI's un-canonical fourth marriage?
... that <b id="mwBVk"><a class="mw-redirect" href="./Patriarch_Euthymius_I_of_Constantinople" id="mwBVo" rel="mw:WikiLink" title="Patriarch Euthymius I of Constantinople">Euthymius<span id="mwBVs" typeof="mw:Entity"> </span>I</a></b> became <a class="mw-redirect" href="./Patriarch_of_Constantinople" id="mwBVw" rel="mw:WikiLink" title="Patriarch of Constantinople">Patriarch of Constantinople</a> because his predecessor, <a href="./Nicholas_Mystikos" id="mwBV0" rel="mw:WikiLink" title="Nicholas Mystikos">Nicholas Mystikos</a>, refused to sanction Emperor <a href="./Leo_VI_the_Wise" id="mwBV4" rel="mw:WikiLink" title="Leo VI the Wise">Leo<span id="mwBV8" typeof="mw:Entity"> </span>VI</a>'s un-<a href="./Canon_law" id="mwBWA" rel="mw:WikiLink" title="Canon law">canonical</a> fourth marriage?