He was the author of the Gaelic poem Dál chabhlaigh ar Chaistéal Suibhne ("An assembling of a fleet against Castle Sween").
hiː wʌzðɪ ˈɔːθɚɹ ʌvðə ɡˈeɪlɪk pˈoʊᵻm dˈɑːl tʃˈæbɬeɪɡ ˈɑːɹ tʃˈeɪsteɪəl sˈuːɪbhn"ɐn ɐsˈɛmblɪŋ əvə flˈiːt ɐɡˈɛnst kˈæsəl swˈiːn".