a genealogy, cited by geoffrey keating, states: ""tadhg son of cian, son of oilill olom, had two sons, namely, connla and cormac gaileang. from iomchaidh son of connla comes o cearbhaill, and from fionnachta son of connla comes o meachair. from cormac gaileang son of tadhg, son of cian, comes o eadhra and o gadhra and o conchubhair ciannachta. the following are the territories they acquired, namely: gaileanga, east and west; ciannachta, south and north; luighne, east and west."