The <a href="https://en.wikipedia.org/wiki/Treaty_of_Alcáçovas" id="mwNQ" rel="mw:WikiLink" title="Treaty of Alcáçovas">Treaty of Alcáçovas</a> is signed by the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Catholic_Monarchs" id="mwNg" rel="mw:WikiLink" title="Catholic Monarchs">Catholic Monarchs</a> of <a href="https://en.wikipedia.org/wiki/Crown_of_Castile" id="mwNw" rel="mw:WikiLink" title="Crown of Castile">Castile</a> and <a href="https://en.wikipedia.org/wiki/Crown_of_Aragon" id="mwOA" rel="mw:WikiLink" title="Crown of Aragon">Aragon</a> on one side and <a href="https://en.wikipedia.org/wiki/Afonso_V_of_Portugal" id="mwOQ" rel="mw:WikiLink" title="Afonso V of Portugal">Afonso V</a> and his son, <a href="https://en.wikipedia.org/wiki/John_II_of_Portugal" id="mwOg" rel="mw:WikiLink" title="John II of Portugal">Prince John</a> of Portugal.