Ceallach mac Guaire (died 665) was King of

Uí Fiachrach Aidhne Uí Fhiachrach Aidhne (also known as Hy Fiachrach) was a kingdom located in what is now the south of County Galway. Legendary origins and geography Originally known as Aidhne, it was said to have been settled by the mythical Fir Bolg. Dubhaltac ...

. Ceallach was a son of the previous king, but reigned for only two years. In 664 ''"A great mortality prevailed in Ireland ... called the Buidhe Connail"'' and in 666 ''"A great plague raged"'' which killed hundreds in

Connacht Connacht ( ; ga, Connachta or ), is one of the provinces of Ireland, in the west of Ireland. Until the ninth century it consisted of several independent major Gaelic kingdoms (Uí Fiachrach, Uí Briúin, Uí Maine, Conmhaícne, and Delbhn ...

. However it is not known if either event led to Ceallach's demise.

References

* ''Irish Kings and High-Kings'', Francis John Byrne (2001), Dublin: Four Courts Press, * ''Annals of Ulster'' a
CELT: Corpus of Electronic Texts
a
University College Cork
Nobility from County Galway 7th-century Irish monarchs 665 deaths Year of birth unknown {{ireland-noble-stub