The largest component of medieval Irish armies were the Kern (ceitherne or ceitheirn -- 'a warband'). Sometimes composed of displaced nobility and other times commoners in search of loot, these were mercenary forces that saw action in many conflicts across the British Isles.
Our Kern displays a distinctly Irish form of hilt, with its ring pommel and slightly "S" curved ornate bowtie guard.
Oakeshott describes the Type XIX as a broad flat blade that has clearly chamfered edges that run nearly parallel, a fuller that runs through the upper third, and a flat ricasso section at the base of the blade. The blade is of hexagonal cross-section