[speckled, variegated]. King of Dál Riada, the Irish enclave in north Strathclyde (until 1974, Argyllshire), Scotland, who did battle with Domnall (1) as part of an Irish dynastic dispute. Domnall Brecc was defeated at the Battle of Mag Rath (Moira), c.637, coincident with the madness of Suibne; see BUILE SHUIBHNE. Domnall Brecc's magical shield was penetrated by Conall during the fighting.
From A Dictionary of Celtic Mythology in Oxford Reference.