<a href="https://en.wikipedia.org/wiki/John_II_of_Castile" id="mwJg" rel="mw:WikiLink" title="John II of Castile">John II of Castile</a> defeats the <a href="https://en.wikipedia.org/wiki/Infantes_of_Aragon" id="mwJw" rel="mw:WikiLink" title="Infantes of Aragon">Infantes of Aragon</a> at the <a href="https://en.wikipedia.org/wiki/First_Battle_of_Olmedo" id="mwKA" rel="mw:WikiLink" title="First Battle of Olmedo">First Battle of Olmedo</a>.