A Kingship Transformed
In 1119, Muirchertach Ua Briain died at Killaloe, ending a weakened southern bid for island-wide overlordship as Tairdelbach Ua Conchobair expanded Connacht influence across Munster. Ireland remained divided: Domnall Ua Lochlainn retained northern power, while Ua Briain successors faced rivalry, partition and Connacht intervention. Tairdelbach’s Shannon fleet, supported by Leinster, Osraige and Dublin allies, depleted Munster’s resources, though Thomond forces suffered defeat in Kerry. The year also saw massacre of poet Cú Collchaille Ua Baigelláin’s household and Niall Ua Lochlainn’s killing, threatening northern succession. Church reform, monasteries, farming, towns and waterways underpinned political, economic and cultural life in significant ways.
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Munster Divided
In 1118, Diarmait Ua Briain’s death intensified Munster’s succession crisis and enabled Toirdelbach Ua Conchobair of Connacht to reshape southern politics. After fighting near Glanmire, where Brian Ua Briain was killed, Toirdelbach allied with Tadc and Cormac Mac Carthaig. He allocated Desmond to Mac Carthaig and Thomond to Diarmait’s sons, securing obedience through hostages and weakening Uí Briain supremacy. He also attacked Kincora and extended influence over Dublin, Leinster and Osraige. Regional warfare continued elsewhere. Royal deaths, church affairs, learning and burdens of military hostings reflected a society unsettled by conflict. The unstable partition nevertheless established Munster’s enduring political division.
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Power in Transition
Ireland in 1117 remained fragmented as Muirchertach Ua Briain’s illness and family rebellion weakened Munster, while Tairdelbach Ua Conchobair of Connacht expanded his influence. Connacht forces defeated Munstermen at Lettracha Odráin after destructive reciprocal raids, and Tairdelbach took hostages from Mide’s king. Leinster and Dublin lost their shared ruler, Diarmait son of Énna, while northern kindreds continued violent rivalries. Church life was marked by numerous clerical deaths, notably reformer Máel Muire Ua Dúnáin, and the killing of Kells’ coarb and community. Following the 1116 famine, warfare intensified hardship for communities, more clearly exposing shifting overlordship, ecclesiastical vulnerability and regional interdependence.
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Famine and Fracture
In 1116, Ireland faced intertwined dynastic, military and environmental crises. Munster’s Uí Briain kingship fractured as Diarmait displaced the ailing Muirchertach, enabling Connacht’s Toirdelbach Ua Conchobair to raid Thomond, burn Kincora and challenge Munster forces. Severe winter weather produced famine and pestilence, especially in Leinster and southern Ireland, causing mortality, displacement and abandoned settlements; warfare worsened shortages through plunder and captivity. Fires damaged major ecclesiastical centres, including Armagh, Killaloe, Cork, Emly, Lismore, Aghaboe and Clonard, while attacks struck church communities. Despite disruption, Cellach of Armagh completed a Connacht visitation, demonstrating enduring ecclesiastical authority and institutional resilience amid severe widespread hardship.
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Winter of Rival Kings
In 1115, severe frost and snow caused widespread hunger, livestock deaths and disruption across Ireland, particularly Leinster. Muirchertach Ua Briain recovered from illness, regained Munster after his brother Diarmait’s capture, and reasserted influence through campaigns in Brega and Dublin, where his son’s forces defeated Leinster leaders. Yet attacks on churches at Ardbraccan and Clonmacnoise exposed warfare’s damage to sacred centres. Tairdelbach Ua Conchobair raided Thomond, removed a Ua Briain claimant, survived internal opposition, deployed a Shannon fleet and allied with Mide. His gifts at Clonmacnoise combined piety and political display. Despite Muirchertach’s recovery, Connacht’s growing power signalled a shifting balance.
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A Kingship Unravels
In 1114, Muirchertach Ua Briain’s illness shattered his dominance of Ireland, enabling his brother Diarmait to seize Munster and confine him at Killaloe. Domnall Ua Lochlainn led a northern coalition into Munster, but its campaign ended in a year’s truce, influenced by the independent Connacht king, Tairdelbach Ua Conchobair. Tairdelbach suppressed rivals, raided Meath and consolidated Connacht. Elsewhere, warfare, killings, depositions and blinding exposed unstable successions. Church reform coexisted with monastic institutions, whose leaders’ deaths and fires were recorded. Raids, forced provisioning and livestock disease damaged communities. No settlement emerged: Uí Briain power waned as Connacht became a decisive rival.
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Armies Held Apart
In 1113, Ireland was dominated by rivalry between Muirchertach Ua Briain of Munster and Domnall Ua Lochlainn of Ailech, whose coalitions threatened conflict. Domnall expelled Donnchad Ua hEochada and partitioned Ulaid, while Muirchertach mobilised Leinster and Connacht forces in response. On two occasions Cellach, successor of Patrick at Armagh, prevented battle, ultimately securing a year’s truce with the sacred Bachall Ísu. The events demonstrated Armagh’s ecclesiastical authority amid church reform. Local dynastic killings, cattle mortality, pilgrimage deaths on Croagh Patrick, and shrine-work at Clonmacnoise also reveal instability, devotion, economic vulnerability, and patronage. Neither overking prevailed before Muirchertach’s illness in 1114.
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Fire and Foray
In 1112, rivalry between northern overking Domnall Ua Lochlainn and Munster’s Muirchertach Ua Briain shaped Irish politics. Domnall raided Fine Gall near Dublin, seizing cattle and captives, demonstrating northern power in a prosperous region. Armagh’s enclosure, church and neighbouring quarters burned on 23 March, amid implementation of diocesan reforms agreed at Ráith Bressail. Deaths included leading officers of Derry, Kildare and Clonfert, illustrating enduring ecclesiastical and dynastic institutions. Terryglass and Fore also suffered fires, while a local aristocrat was killed. Conversely, an abundant mast crop aided rural households and pig husbandry, underscoring countryside wealth vulnerable to warfare and disruption alike.
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Synod of Ráith Bressail
In 1111 Ireland remained divided among competing rulers, notably Muirchertach Ua Briain in the south and Domnall Ua Lochlainn in the north, while Tairdelbach Ua Conchobair extended Connacht’s influence. Raids, hostage-taking, dynastic conflict and attacks on churches, including Clonmacnoise, demonstrated political instability. The Synod of Ráith Bressail, attended by leading clerics and royal patrons, promoted ecclesiastical discipline and a territorial diocesan framework under Armagh and Cashel, though implementation was uneven. A Meath synod also negotiated church boundaries. Ulaid’s conflict with Cenél nÉogain, harsh winter conditions, and fires at several settlements further affected society, trade and rural livelihoods across Ireland broadly.
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Power Across Provinces
In 1110, Ireland remained divided among local and provincial rulers, dominated by Muirchertach Ua Briain of Munster and Domnall Ua Lochlainn of Ailech. Ua Lochlainn raided Connacht, taking many cattle and captives, while its young king, Tairdelbach Ua Conchobair, won at Ros but suffered defeat at Mag Brengair. Elsewhere, the Ulaid plundered Mucnám and regional kings were killed. Dynastic deaths affected Munster and northern alliances. Cellach of Armagh visited Mide, collecting dues and advancing church reform. Learned churchmen also died. Annals chiefly preserve elite violence and religion, while rural farming, trade, craftsmanship and learning sustained wider society throughout the year.
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