The Battle of Kellistown was fought on this day between the forces of the <a href="https://en.wikipedia.org/wiki/English_people" id="mwMQ" rel="mw:WikiLink" title="English people">English</a> led by <a href="https://en.wikipedia.org/wiki/Roger_Mortimer,_4th_Earl_of_March" id="mwMg" rel="mw:WikiLink" title="Roger Mortimer, 4th Earl of March">Roger Mortimer, 4th Earl of March</a> against the O'Byrnes and O'Tooles under the command of <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Art_Óg_mac_Murchadha_Caomhánach" id="mwMw" rel="mw:WikiLink" title="Art Óg mac Murchadha Caomhánach">Art Óg mac Murchadha Caomhánach</a>, the most powerful Chieftain in Leinster.