It gives an account of the twelve sons of Kennedy, son of Lorcan, Brian's father; and of ye Dalcassian race in general. A book of annals from the year 976 to 1014, including a good account of the battle of Clontarf, etc.

After the last-named followed Murhertach also of the Dalcassian house, at whose death the rule once more swung round to the house of Hy-Nial and Donald O'Lochlin reigned nominally until his death in 1121. Next the O'Connors, of Connaught, took a turn at the sovereignty, and seized possession of Cashel which since its capture by Brian Boroimhe had been the exclusive appanage of the Dalcassians.

In Munster, Aengus, the King of Cashel, with all the nobility of his clan, embraced the faith. A number of chieftains in Thomond are also mentioned; and the whole of the Dalcassian tribe, so celebrated before and after in the annals of Ireland, received, with the waters of baptism, that ardent faith which nothing has been able to tear from them to this day.

The other, Brian Boroimhe, commonly known to English writers as Brian Boru, a chieftain of the royal Dalcassian race of O'Brien, and the most important figure by far in Irish native history, but one which, like all others, has got so fogged and dimmed by prejudice and misstatement, that to many people his name seems hardly to convey any sense of reality at all. Poor Brian Boru!