Emperor <a href="https://en.wikipedia.org/wiki/Gia_Long" id="mwhQ" rel="mw:WikiLink" title="Gia Long">Gia Long</a> conquers <a href="https://en.wikipedia.org/wiki/Hanoi" id="mwhg" rel="mw:WikiLink" title="Hanoi">Hanoi</a> and unified <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Viet_Nam" id="mwhw" rel="mw:WikiLink" title="Viet Nam">Viet Nam</a>, which had experienced centuries of feudal warfare.