Events from the year 1187 in Ireland.
Incumbent Lord: John
Events The Rock of Loch Cé (Lough Key) was struck by lightning at midday, resulting in many deaths. In particular, Duvesa (Duibhessa); wife of Conchobair Mac Diarmata, lord of Moylurg; was burned and drowned, along with seven hundred or more people in the same event. Deaths Ruaidhri Ua Flaithbertaigh, king of Cenél-Eógain, was killed on a foray in Tir-Conaill Murtough O’Maeluire, Bishop of Clonfert
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