Art Og MacMurrough-Kavanagh
1357 – 1417
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About
Art Mor MacMurrough Kavanagh was the great king of Leinster who fought Richard the Second of England to a standstill and kept the Gaelic revival alive in the south-east for sixty years. He is the secure head of the wired Kavanagh kings; the line traditionally runs on from him, through the medieval kings of Leinster, to Domhnall Caomhanach son of Diarmait MacMurchada, but those intervening thirteenth-century links are matters of the annals and O'Hart, not securely evidenced generation by generation, and are left as an honest edge rather than hardened.
Research notes
ART MOR (Art Og) mac Murchadha Caomhanach, King of LEINSTER (1357-1417); father of Gerald (our line). DOCUMENTED FLOOR of the wired Kavanagh spine: the traditional descent hence to Diarmait MacMurchada (I99610, already an ancestor by other roads) is noted but NOT wired, per the evidence-weighting standard. Standard documented Anglo-Norman/Irish genealogy per the cited authorities; contested rungs note-only, not hardened. || *** CORRECTED 19 Oct 2026 (agreed with Aynsley): this is ART OG (Art mac Airt), King of Leinster 1375-c.1417 (b. 1357, d. c. Dec 1417 at Ferns or New Ross, bur. St Mullin's), the king who fought Richard II - often called 'Art Mor' but son of Art Mor (I101340, now wired). m. Elizabeth le Veel (I101341), mother of Donnchadh, Diarmuid Lamhdearg and Gerald, Lord of Ferns (our line). The chain from Art Mor up to Domhnall Caomhanach (d.1175), son of Diarmait MacMurchada (I99610) - Muirchertach, Muiris, Muirchertach, Donal Og - rests on O'Hart's Irish Pedigrees and genealogical tracts only, so it stays UNWIRED. Sources: Wikipedia 'Art Og Mac Murchadha Caomhanach' (citing F.J. Byrne, Irish Kings and High Kings; E. O'Byrne, War, Politics and the Irish of Leinster 1156-1606; Annals of the Four Masters; DNB vol. 35).