Fir Lemna - or Uí Tuathail, the Fir Lemna were cited as one of the Trí Tuatha of Oirghialla (along with Síl Dubthir and Uí Cremthainne). Fir Lemna is thought to have been near Clogher (Clochar mac nDaimin) in modern county Tyrone. Another name for it was given as Síl Tuathail in Tuaiscirt. Mag Lemna is given in the parishes of Clogher and Errigal Keerogue in southern co. Tyrone and bordering co. Monaghan. Their ancestry is claimed from Tuathal, son of Daimíne (a quo Síl Daimini), son of Cairpre Damargait, son of Echach, son of Crimthann, son of Fiacc, son of Daig Duirn, son of Rochaid, son of Colla Fochríth. O'Dugan (Poems) notes the sept of O'Caomhain as a king of Magh Leamhna. King of Magh Leamhna The Uí Neill sept of Mac Cathmaoil (the McCawells, alias Campbells) were chiefs of Clann Fogarty which included the barony of Clogher, co. Tyrone. Mac Cathmhaoil were cited as a chiefs of Cenél Feradaig (Kinelfarry), of Clann Oengusa, and of Clann Duibinrecht, and of Clann Fogartaig according to the Annals of Ulster.
An early genealogy for Clann Ceallaigh:(Rawlinson) Ceallach, son of Tuathal, son of Maelduin, son of Tuadan, son of Tuathal, son of Daimíne, son of Cairpre Dam Argait. An early genealogy for Clann Nadsluaigh: (Rawlinson) Nadsluaigh, son of Cairpre Dam Argait, son of Eocho, son of Crimthann Lethan, son of Fiacc, son of Daig Duirn, son of Rochaid, son of Colla Fochríth (da-Chrioch). An early genealogy of Síl Daimine:(Rawlinson) Daimíne, son of Cairpre Dam Argait, son of Eocho, son of Crimthann Lethan, son of Fiacc, son of Daig Duirn, son of Rochaid, son of Colla Fochríth (da-Chrioch). An early genealogy for Clann Lugain:(Rawlinson) Lugain, son of Irgalach, son of Eignich, son of Cormac, son of Fergus, son of Aed, son of Cormac, son of Cairpre Dam Argait.
- CS722, Fergal son of Echaid of Lemna, king of Tamnach, was killed at the battle of Almain.
- FA722, Fergal mac Echach Lemna, king of Tamnach Síl Daimini, was killed at the battle of Almu—high.
- U770, Artgal, abbot of Clochar Mac nDaiméni, dies.
Mentioned with Fir Leamhna and Uí Cremthainn as one of the Trí Tuatha of Airghialla. The sept of Ua Laithéin are noted as chiefs of Síl Duibtire in the 10th/11th century. O'Dugan (Poems) cites the tribe of Duibhthire, over the Clanna-Daimhin in Oirghialla, quite likely a reference to Síl Duibthir.
- U914, Mael Ruanaid son of Cumuscach, chief of Síl Duibthire
- M929, Ceannfaeladh, son of Lorcan, comharba of Cluain-Eois and Clochar-mac-Daimheini, died.
- U931, Cenn Faelad son of Lorcán, superior of Cluain Eóis and Clochar of the sons of Daiméne, and tanist-abbot of Ard Macha, rested.
- U951, Gairbíth son of Lorcán, king of Fir Leamna, died.
- U1062, Eochaid ua Laithéin, king of Síl Duibtire, died in penitence.
- M1080, The battle of Ath-Erghail, by the site of Clochar, was gained over the Feara-Manach, by Domhnall Ua Lochlainn and the men of Magh-Itha, where fell the plunderers of Ard-Macha, namely, Sitric Ua Caemhain, and the son of Niall Ua Searraigh, and many other persons.
- U1086, Cumuscach ua Laithéin, king of Síl Duibtire, fell.
- U1089, Muirchertach ua Laithéin, king of Síl Duibtire, died.
- LC1127, Gillachrist Ua hEighnigh, king of Feara-Manach, and chief king of Oirghiall, died in Clochar-Uí-nDaimhin, after choice penance.
- M1395, Ardstraw and Clogher Mac Daimhin, with all their various riches, were burned.
Uí Cennfhada - Tír Cendfhada, aka Ui Cennfota or Uí Ceinneidigh, gave its name to the barony of Tirkennedy, co. Fermanagh. The Uí Ceinneidigh are noted in the general area in the 12th century, and the sept of Ó Daimhín are later given as chiefs here, according to the Irish Annals. The Uí Cennfhota are claimed to descend from Fergus Cennfhota son of Cremthann, the eponymous ancestor of the Uí Chremthainn. In the same lineage, Ó Daimhín claims descendancy from "Daimhin" who died in 966, a son of Cairbre Dam Argait, King of Oriel. Their surname may have been anglicized as O Davin, rather than O Devine.
- LC1129, Niall Ua Crichain, king of Uí-Fiachrach of Ard-sratha, was slain by the Uí-Ceinneidigh.
- U1275, Flaithbertach Ua Daimin, king of Fir-Manach; rested in Christ.
- U1346, Donn Ua Daimin, chief of Tir-Cennfota, died.
- U1427, Brian Ua Daimin, chief of Tir-Cenufhada, died on the 8th of the Ides 6th of January.