<a href="https://en.wikipedia.org/wiki/Ferdinand_II_of_Aragon" id="mwKg" rel="mw:WikiLink" title="Ferdinand II of Aragon">Ferdinand II of Aragon</a> marries <a href="https://en.wikipedia.org/wiki/Isabella_I_of_Castile" id="mwKw" rel="mw:WikiLink" title="Isabella I of Castile">Isabella I of Castile</a>, a marriage that paves the way to the unification of Aragon and Castile into a single country, Spain.