Ceallach mac Guaire
Encyclopedia
Ceallach mac Guaire was King of Uí Fiachrach Aidhne
Uí Fiachrach Aidhne
Uí Fhiachrach Aidhne was a kingdom located in what is now the south of Co. Galway.-Legendary origins and geography:...

.

Ceallach was a son of the previous king, but reigned for only two years. In 664
664
Year 664 was a leap year starting on Monday of the Julian calendar. The denomination 664 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.- Asia :* Arab armies conquer Kabul.* Kuo Wu Tsung of Tang...

 "A great mortality prevailed in Ireland ... called the Buidhe Connail" and in 666
666
Year 666 was a common year starting on Thursday of the Julian calendar. The denomination 666 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.- Europe :* Chertsey Abbey is founded.* Barking Abbey...

 "A great plague raged" which killed hundreds in Connacht
Connacht
Connacht , formerly anglicised as Connaught, is one of the Provinces of Ireland situated in the west of Ireland. In Ancient Ireland, it was one of the fifths ruled by a "king of over-kings" . Following the Norman invasion of Ireland, the ancient kingdoms were shired into a number of counties for...

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