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it received its present name from Oilill, the son of Eochaidh Moghmedon and Mongfinn.

From whence the Uí Ailella? - their ancient territory is described in southeast Co. Sligo, which included the baronies of Tirerril and part of Corran. The early tribe of the Calraighi Mora are also cited in Corran.

The name Uí Ailella apparently comes from that of Ailill, son of Eochuid Mugmedón, Úi Ailella Connacht. Their territory is referenced as Uí Ailella, Tir Ailella, Tir Oilella, and finally corrupted into Tirerril. Very little information seems available on the early lords of Uí Ailella, and it is not until the 13th century that we find reference to the notable families of the area, i.e. those of the Ui Briuin. This includes the MacDonnchadha (MacDonagh) and their higher ranked cousins the MacDiarmada (MacDermot) of clann Mhaoil Ruanaidh. The O'Floinn (O'Flynns) were noted as chiefs of Síol Maoil Ruanaidh in co. Roscommon, in the 12th through 14th centuries.
The Mac Donagh surname originates from Donnchadh, son of Tomaltach na cairge (of the rock) ua Mac Diarmata, who was King of Moylurg 1197-1207. They later split into two groups, one based with one based in Colloney and Ballindoon (Tirerril), and the other in Ballymote (Corran). The MacDonaghs were vassals of the MacDermots until some time in the 15th Century when they came under the lordship of O'Donnell and O'Conor Sligo.

An early genealogy of Clann Donnchada :   (Book of Ballymote)
Tomaltach m. Taidhg m. Tomaltaig m. Muirghiusa m. Donnchaid (a quo Clann Donnchada) m. Tomaltaigh m. Concobair m. Diarmada (a quo Mac Diarmada) m. Taidhg m. Maelruanaid m. Taidhg m. Muircertaigh m. Maelruanaid moir (a quo Clann Maelruanaid).

The Annals cite for Ui Aillela, et al :

• For 546, Ailbe Senchua Ua n-Ailello, died.

• For 753, The battle of Lorg between the Ui Ailella and the Gailenga.

• For 785, The battle of Ath Rois was gained by the Ui Ailella over the Luighni, in which Dubh Dathuath, son of Ailill or of Flaithgusa, lord of the Three Tribes, was slain.

• For 792, The battle of Ard Maicc Rimi in which the Uí Ailella were overthrown and Conchobor and Airechtach grandsons of Cathal fell. Cathmug son of Flaithbertach, king of Cairpre, and Cormac son of Dub dá Crích, king of Breifne, also fell.

• For 1024, Domnall h-úa h-Egra, rí in Coraind mortuus est.

• For 1248, Fagartach O Dobailein ( O'Devlin) Lord of Corran in the county of Sligo, died.

• For 1272, Maurice, son of Donnchadh [Ua Maelruanaigh] lord of Tir-Oilella.

• For 1318, Tomaltach Mac Donnchada, tigerna Tiri hOilella.

• For 1333, Tomaltach Mac Donnchada, Lord of Tir Ailella, died (again?).

• For 1339, Tadhg Mac Donnchaidh, king of Tir-Oilella, was expelled by Concobur Mac Diarmata, [namely] by his own lord and by his own kinsman and Fergal, son of Tomaltach Mac Diarmata, took Tir-Oilella after him.
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• For 1340, Concubar Mac Diarmata, king of Magh-Luirg and Airteach and Tir-Oilella and Tir-Tuathail and the Renna and the seven towns of Clann-Cathail.

• For 1349, Maurice Mac Donough, Chief of Corran, a man full of intelligence and hospitality, died.

• For 1359, Brian Mac Donnchaidh, royal heir of Tir-Oilella, was slain.

• For 1383, Tadhg Mac Donnchaidh, king of Tir-Oilella, died.

• For 1406, Mailruanaigh, son of Tadhg Mac Donnchaidh, namely, king of Tir-Oilella, died this year.

• For 1409, Conchobhar Mac Donnchaidh, king of Tir-Oilella.

• For 1441, Conchobar son of Tadc Mac Donnchada, king of Ui Ailella, died.

• For 1453, Brian son of Conchobar Mac Donnchada, full-king of Ui Ailella and the Coran, died

• For 1463, Tadc son of Tomaltach Mor Mac Donnchada, half-king of Ui Ailella, died.

• For 1467, Mac Donnchadha of Tir-Oilella., i.e. Ruaidhri, son of Conchobhar Mac Donnchadha, died.

• For 1470, Brian, the son of Teige Mac Donagh, Lord of Ath-Cliath-an-Chorainn (i.e. of Ballymote).

• For 1470, Mac Donnchaidh of the Corann, i.e. Brian son of Tadhg, was killed by Mac Donnchaidh of Tir-Oilella, i.e. Tadhg son of Brian.

• For 1495, Mac Donnchadha of Tir-Oilella, i.e. Tadhg, the son of Brian, son of Conchobhar, was killed by O'Domhnaill.

• For 1511, Mac Donnchadha of Tir-Oilella, i.e. John, son of Tadhg, son of Brian Mac Donnchadha, died in his own fortress in Baile-an-duin. Ferghal, the son of Tadhg, son of Brian, i.e. the royal heir of Ui-Oilella, was slain the same year by the sons of Ruaidhri Mac Diarmada.

• For 1524, Mac Donnchadha of Tir-Oilella, i.e. Ruaidhri, son of Tomaltach, son of Brian, died; and a great war occurred amongst the Clann-Donnchadha regarding the sovereignty of the country; and Cormac, son of Tadhg, son of Brian, was made Mac Donnchadha.

• For 1552, A great war broke out between O'Conchobhair i.e. Ruaidhri, son of Felim, son of Maghnus, and the son of O'Conchobhair, i.e. Domhnall, the son of Tadhg, son of Cathal Og; and the Clann-Maelruanaidh were in two divisions, opposed to one another, with this. Sil-Conchobhair, viz., Mac Diarmada and his sons, and Mac Donnchadha of Tir-Oilella, were with O'Conchobhair (i.e. with Domhnall), and the sons of Eoghan Mac Diarmada, and Mac Donnchadha of the Corann, with O'Conchobhair; and it is not possible to calculate or over-reckon what was destroyed in that war.

• For 1577, Baile-an-muta (Ballymote) was taken by Saxons in treachery; and Mac Donnchadha was captured by them there, i.e. Aedh, son of Cairbre, son of Tadhg, the lord of the place itself, and Cormac, son of Tadhg-an-triubhais i.e. Mac Donnchadha of Tir-Oilella.