Fergus Finnbheoil, Fenian poet, [259], [512], [513]
Ferguson, Sir Samuel, poem on Crom Cruach, [87]; on ogams, [120]; translation from O'Gnive, [522]; on the Brehon Law, [586]
Fiacc, or Fiach, of Sletty, [89]; his Life of Patrick, [152] ff., [227]; learns the "alphabet," [112]
Fiachra, brother of Niall of the Nine Hostages, [93]
Fiachaidh, [62]
Fiachaidh Sreabhtine, [65], [75]
Fiachaidh, High King, [29]
Fiacadh, a Tuatha De Danann, [52]
Filé, the, in Ireland, [486]
Fierebras, chanson de geste, in Irish, [572]