The Annals of Connaught, another ancient manuscript, often quoted, was in the possession of Dr. Charles O'Conor. A copy is in the Library of the Royal Irish Academy. It contains chiefly the history of Connaught, from the thirteenth to the sixteenth century; and is considered to have been compiled chiefly by the O'Maolconrys as Historiagraphers of Connaught. A beautiful manuscript on vellum, folio size, now deposited in the Bodleian Library at Oxford, and containing partly in poetry, and partly in prose, the history of Fionn MacCumhail [Finn MacCoole] and the celebrated Fenian heroes of Ireland in the third century, and some of the poems ascribed to Oisin, was composed by one of the O'Maolconrys, about the fourteenth century. Dr. Drummond in his Prize Essay on the poems of Oision, states that MacPherson, the celebrated author of "Ossian's Poems," on visiting Oxford, was shown the above memtioned Irish manuscript, as containing the Poems of Oisin, a single word of which he was unable to read.
You will notice in the Annals of Connacht the Eagan/Egan/MacEgan is written as 'Mac Aedacain.'
The entries after the jump.
1225 - Tadc O Finnachta, an officer of Aed son of Ruaidri [O Conchobair] was killed by Mac Aedacan's men on a plundering raid in this same year.
1235 - An Gilla Suasanach (the Mop-haired Lad) Mac Aedacain died this year.
1249 - When Jordan [D'Exeter] and the Galls saw this they issued from the town against the princes. Mary wrought a miracle then; for when the princes and their followers saw the horsemen in arms and armour making towards them, horror and dread seized them and they were put to flight. Aed son of Aed O Conchobair was kilked there, and Diarmait Ruad son of Cormac O Mailsechlainn, O Cellaig's two sons, Brian of the Wood son of Magnus, Carrach Insiubail son of Niall O Conchobair, Baethgalach Mac Aedacain, Mathgamain son of Tadc son of Diarmait Bachlach O Conchobair, Lochlainn O Conchobair's two sons, Domnall son of Cormac Mac Diarmata, Finadanach Mac Branain, Cu Muman Mac Casurlaig, and many others.
1273 - Jordan D'Exeter raided the Corann, and a few of the Connacht princes came up with his party; but they were incited to an unwise move by an evil (?) man, so that Domnall son of of Donnchad son of Magnus [O Conchobair] and Magnus son of Art and Oirechtach Mac Aedacain and Aed O Birn and many others were killed.
1309 - Aed son of Eogan son of Ruaidri son of Aed son of Cathal Croberg, king of Connacht and eligible for his nobility, valour, generosity, form and feature for the kingship of Ireland, was killed by Aed Brefnech son of Cathal Ruad O Conchobair at Coill in Chlachain in the territory of Brefne. Many of the great men of Connacht were killed with him, such as Conchobair Mac Diarmata, Diarmait Ruad son of Tadc son of Andrias O Conchobair, Diarmait son of Cathal Carrach Mac Diarmata and Aed son of Muirchertach son of Tadc son of Maelruanaid [Mac Diarmata]. And of the Eastern party there fell on that same day Diarmait Oc O hElide, a noble loyal princely yeoman, Maeldomnaig the Gallowglass, Gilla na Naem Mac Aedacain, ollav of Connacht in Law and a universal master equally skilled in all arts, Fagurtach O Dobailein of the household of Mac Donnchada and many others besides these. The losses on both sides were not less than a hundred. Aed Brefnech came into the country afterwards and the Three Tuatha submitted to him.
1316 - But on hearing that William Burke had come into Connacht from Scotland, Feidlim called upon his subjects to assemble an army to expel him; and the army was assembled from all the region between Assaroe and Aughty. Moreover Donnchad O Briain, king of Thomond, came with his assembled host, and O Maelsechlainn, king of Meath, O Ruairc, king of Brefne, O Fergail, king of Conmaicne, Tadc O Cellaig, king of Ui Maine, and many more of the kings' and chieftains' sons of Ireland assembled to him. And they all marched to Athenry to oppose William Burke, Mac Feorais, and the other Connacht Galls, and joined battle with them in fron of the town. The Gaels were defeated and Feidlim O Conchobair, who was king of Connacht and entitled to become King of Ireland without opposition, was killed there and Tadc O Cellaig, king of Ui Maine fell with him, together with twenty-eight men who were entitled to succeed to the kingship of Ui Maine. Magnus son of Domnall O Conchobair, tanist of Connacht, was killed, as were Art O hEgra, king of Leyney, Maelschlainn Carrach O Dubda, Muirchertach son of Conchobair O Dubda, Conchobair Oc O Dubda, Diarmait Mac Diarmata, an eligible prince of Moylurg, Muirchertach son of Taichlech Mac Diarmata, Muirchertach son of Diarmait son of Fergal [Mac Diarmaita], Maelsechlainn Oc Mac Magnusa, Sean son of Murchad O Matadain, Domnall son of Aed O Con Chenainn, king of the Ui Diarmata, and Muirchertach his brother, Murchad O Matadain, Domnall O Baigill, Donnchad O Mailmuaid and his followers, the son of Murchad Mag Mathgamma and a hundred of his men, Niall Sinnach, king of Tethba, and his followers, Fergal son of Seoan Gallda O Fergail, Uillial son of Aed Oc O Fergail, Tomas son of Amlaib O Fergail. Five of the Clann Donnchaid fell there, viz. Tomaltach son of Gilla Crist Mac Donnchaid, Murchad, Mac Donnchaid, Conchobair son of Tadc, Muirchertach and Maelsechlainn Mac Donnchaid. Eoin Mac Aedacain, brehon to O Conchobair, Gilla na Naem son of Dail re Docair O Dobailein, the standard-bearer, and Tomas O Conallain fell around their lord. Moreover it is hard to say how many of the men of Munster and Meath and of Ireland generally were killed there; in the words of the poet: 'Many of the men of all Ireland [lay dead] about that great field; many a king's son, whom I name not, of the Meath and Munster hosts was killed in that great rout; my heart rues the fight.' These deeds were done on the day of St. Lawrence Martyr. Fedlimid was a man of twenty-three when he was killed, and he reigned for five years till Ruairdi son of Cathal usurped the kingship from him for half a year, and he reigned again for half a year after Ruaidri's death till he was slain in this battle of Athenry.
1317 - Mael Isa Ruad Mac Aedacain, a master Brehon in the ancient law, died.
1320 - An important meeting between Cathal O Conchobair and Maelruanaid Mac Diarmata, where they mad a wise and friendly peace. Afterwards Mac Diarmata came [back] into the country and this Cathal acted treacherously towards him and he was captured at Mullach Doramnach and his wife, Graine daughter of Mac Magnusa, at Rockingham. The countryside was then ravaged and Mael Isa Donn Mac Aedacain and his son and Tomaltech Mac Donnchada, lord of Tirerril, were also captured.
1327 - Sadb daughter of Mac Aedacain died.
1355 - Tadc Mac Aedacain died.
1359 - Aed son of Conchobar Mac Aedacain died this year.
1390 - Brian Mac Aedacain, ollav-brehon of Brefne, died.
1390 - Sean Mac Aedacain the Official, the best man in his post in his time, was killed four nights before Christmas and I do not know who killed him.
1399 - Gilla na Naem Mac Aedacain, ollav of Eastern Munster in Law, and Baethgalach Mac Aedacain, ollav in Law of the Ui Fiachrach and the Ui Amalgaid, died.
1401 - Gilla na Naem Mac Aedacain, judge-ollav of the Ui Failgi and the Cenel Fiachnach, rested.
1409 - Muirchertach Mac Aedacain, law-ollave of Teffia, died.
1411 - Magnus son of Baethgalach Mac Aedacain, prior of Sligo, died.
1422 - The sons of O Mailsechlainn made an attack on Ardnurcher. Mag Eochacan was in the castle with a few men at that time, having with him also Cosnamach Oc Mac Aedacain, law-ollav of the Cenel Fiachach and the Ui Failgi. The brehon mounted his horse and rode after them, thinking them to be the sons of Muirchertach Oc Mac Eochacain, who were in rebellion against Mac Eochacain at that time, he himself having [come to the castle] to make settlement between the parties.
He followed the band westwards out of the town to Topar Brigte. Here the sons of O Mailsechlainn were waiting (?) and at the noise (?) of the rider they discharged the arrows which were ready in their bows and Cosnamach Oc was killed without delay by an arrow shot.
1437 - Gormlaith daughter of Dauid O Duibgennain, wife of Brian Mac Aedacain, and ultimately an anchorite, entered into rest in the monastery of the Trinity on Loch Key.
1438 - Conchobair Mac Aedacain, ollav of Macwilliam of Clanrickard, died.
1443 - Gilla na Naem Mac Aedacain, the teacher of Ireland in his own art, ollav of Ormond, died.
1473 - Mac Aedacain of Ormond, that is Gilla na Naem, died the year after.
1473 - Brian son of Roiberd Mac Aedacain, law-ollav to O Conchobair Don and O hAinlige, [died.]
1473 - Gilla na Naem son of Donnchad Mac Aedacain died.
1474 - Gilla Find Mac Aedacain, ollav to O Conchobair Failgi, died.
1487 - Sean son of Conchobair Mac Aedacain died.
1528 - Magnus son of Domnall Mac Aedacain died.
1529 - Cosnamaid son of Fergal son of Dub Mac Aedacain, a man preminent in Brehon Law and in Poetry, died as was buried at Elpin.
1529 - Mac Aedacain of Ormond, Domnall son of Aed son of Domnall, head of the learning and wisdom of Leth Moght, died.