Art Mór Mac Murchadha Caomhánach (anglicized Art MacMurrough-Kavanagh; died 1416/17) is generally regarded as the most formidable of the later Kings of Leinster. He revived not only the royal family’s prerogatives but their lands and power. During the length of his forty-two year reign he fully lived up to his title dominating the Anglo-Norman settlers of Leinster.