eochaid mac echdach was a king of dál riata from 726 to 733. he was the great-great-grandson of eochaid buide and the chief of the cenél ngabráin, the descendants of gabhrán mac domangairt, who ruled dál riata in the 6th century. eochaid presumably deposed dúngal mac selbaig, the previous king, and fought dúngal's angry father in 727, emerging with success. eochaid died in 733 and was succeeded by muiredach, the cousin of dúngal.