Flann Óc mac Séoan Ó Domhnalláin was Ollamh Síol Muireadaigh for an unknown time in 1404.
Donnchad Baccach Ó Maolconaire died, leaving the office of Irish: Ollamh vacant.
His death was followed by Gilla Duivin Mac Curtin, Ollamh of Thomond in music, Carroll O'Daly, Ollav of Corcomroe; Donnell, the son of Donough O'Daly, who was usually called Irish: Bolg-an-Dana ... William O'Doran, Ollav of Leinster in judicature ... Teige, the son of boethius Mac Egan, intended ollav of Lower Connacht in law.
The eventual successor was Dauid mac Tanaide Ó Maolconaire, who held the office until 1419.
Flann Óc seems to be the only member of the clan Ó Domhnalláin who held the office.