Words and Proper Names

fíu ‘he spent the night’

3489.
Lindeman (Fredrik Otto): Nodiadau amrywiol: [4.] On the development of some Indo- European perfect forms in Celtic.
In BBCS 31 (1984), pp. 94–100.
Discusses the origin of the Old Irish suffixless preterites fíu, fáid and fáig, and the origin of the ā-preterite.