Princess Xenia of Montenegro
... that Princess Xenia of Montenegro's refusal of marriage to Alexander I of Serbia severed diplomatic relations between their two countries?
... that <b id="mwFgM"><a href="./Princess_Xenia_of_Montenegro" id="mwFgQ" rel="mw:WikiLink" title="Princess Xenia of Montenegro">Princess Xenia of Montenegro</a></b><span about="#mwt81" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"`s","href":"./Template:`s"},"params":{},"i":0}}]}' id="mwFgU" typeof="mw:Transclusion"><span typeof="mw:Entity">'</span>s</span> refusal of marriage to <a href="./Alexander_I_of_Serbia" id="mwFgY" rel="mw:WikiLink" title="Alexander I of Serbia">Alexander I of Serbia</a> severed diplomatic relations between their two countries?