Welsh rebel leader <a href="https://en.wikipedia.org/wiki/Owain_Glyndŵr" id="mwPw" rel="mw:WikiLink" title="Owain Glyndŵr">Owain Glyndŵr</a>, having declared himself <a href="https://en.wikipedia.org/wiki/Prince_of_Wales" id="mwQA" rel="mw:WikiLink" title="Prince of Wales">Prince of Wales</a>, allies himself with the French against King <a href="https://en.wikipedia.org/wiki/Henry_IV_of_England" id="mwQQ" rel="mw:WikiLink" title="Henry IV of England">Henry IV of England</a>.