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M1193.10. Inishcloghbran was plundered by the sons of Osdealv, and the sons of Conor Moinmoy.
M1194.5. Gilbert Mac Costello marched, with an army, to Assaroe, but was compelled to return without being able to gain any advantage by his expedition.
M1195.8. Cathal Crovderg O'Conor and Mac Costelloe, with some of the English and Irish of Meath, marched into Munster, and arrived at Imleach Iubhair (Emly) and Cashel. They burned four large castles and some small ones.
M1211.4.An army was led by the Connacians, at the summons of the English bishop and Gilbert Mac Costello, to Assaroe; and they erected a castle at Cael-uisge.
M1212.3. Gilbert Mac Costello was slain in the castle of Cael-uisge; and the castle itself was burned by O'Hegny.
M1214.7. The territory of Carbury Co. Sligo, the possession of Philip Mac Costello, was preyed by Ualgarg O'Rourke, who carried off a number of cows.
M1225.15. The son of Manus then parted from the sons of Roderic, and set out for Tirawley, in quest of his cows and people, and fortunately found them there, without having been plundered or molested. He then took them with him, under the protection of O'Rourke, after having first plundered Philip Mac Costello.
M1285.6. Philip Mac Costello defeated the people of Manus O'Conor on Slieve Gamh, where many of Manus's people were slain.
M1286.3. Philip Mac Costello died.
M1291.7. Thomas Mac Costello was slain, and his brother, David Mac Costello, taken prisoner, and afterwards killed while in captivity.
M1317.6. Melaghlin Carragh Mac Dermot, heir to the lordship of Moylurg; Conor O'Conor (i.e. the son of the coarb of St. Coman); Manus O'Flanagan, heir to the chieftainship of Clann-Cathail, and many others, were slain by Gilbert Mac Costello.
M1330.7. An attack was made by Turlough O'Conor, King of Connaught, upon the camp of Walter, the son of William Burke, at Leagmagh, in Moylurg, and forced him to retreat from thence to Cairthe-liag-fada. Gilbert Mac Costello (at that time Lord of Slieve-Lugha) came with all his forces to aid Mac William; and Tomaltagh Mac Donough, with his people, having turned against O'Conor, came also to Mac William's assistance. These combined forces attacked O'Conor, and an engagement took place between both parties at Ath-Disirt-Nuadan, where Donough, son of Donnell Mac Mahon, Mac Gillacowan and a few of O'Conor's people, were slain. Around the ford O'Conor and the chiefs of his people effected a retreat into the Tuathas by force; and Mac William (then) pitched his camp at Killomad, near O'Conor. The forces of Connaught, both English and Irish (i.e. all those who sided with him), were assembled by Mac William, in order to obtain the kingdom of Connaught for himself, and he had them in readiness to depose O'Conor. When Mac Dermot received intelligence of this, he turned against Mac William. and took part with O'Conor; and a kindly and amicable peace was concluded between both.
M1333.5. Gilbert Mac Costello was treacherously slain in the middle of his own house by Cathal Mac Dermot Gall.
M1336.5. A great depredation was committed by the sons of Dermot Gall Mac Dermot and the son of Felim O'Conor, upon the Clann-Costello; and Maiduic Mac Waldrin was slain while in pursuit of the booty.
M1336.9. Turlough O'Conor, King of Connaught, collected the flitting forces of the Tuathas, Clann-Chathail, Clann-Conor, and Moylurg, and conveyed them to Airteach. Castlemore-Costello was taken and demolished by O'Conor on this occasion, and the kern who guarded it came out under protection of Mac Dermot.
M1340.6. Jordan Roe Mac Costello was slain by Cathal Mac Dermot Gall.
M1340.13. William, the son of Gilbert Mac Costello, was slain in a conflict in Breifny by the people of Teallach-Eachdhach.
M1346.6. Mac Dermot Gall was treacherously killed in his own house by the sons of Waldrin Mac Costello; and Cormac Caech Mac Fineen was slain along with him.
1536. Mac Goisdelbh, i.e. John, son of the Gilla-dubh, a generous, humane man, and a good captain, was killed by Piers Mac Goisdelbh, and by some of the people of Airtech, in hoc anno.
