Battle of Clontarf
|Battle of Clontarf|
|Irish of Munster||Kingdom of Dublin
Vikings of Orkney and Man
|Commanders and leaders|
|Brian Boru †
Murchad mac Briain †
Máel Mórda †
|~7,000 men||~6,600 men|
|Casualties and losses|
|>4,000 dead||~6,000 dead|
The Battle of Clontarf (Irish: Cath Chluain Tarbh) was a battle that took place on 23 April 1014 between the forces of Brian Boru, high king of Ireland, and an alliance of the forces of Sigtrygg Silkbeard, king of Dublin, Máel Mórda mac Murchada, the king of Leinster, and a Viking contingent led by Sigurd, Earl of Orkney, and Brodir of the Isle of Man. It lasted from sunrise to sunset, and ended in a rout of the Viking and Leinster forces. Brian was killed in the course of the battle, as were his son, Murchad, and his grandson, Toirdelbach. After the battle, the Vikings of Dublin were reduced to a secondary power. Brian's family was temporarily eclipsed, and there was no undisputed high king of Ireland until the late twelfth century.
Vikings first established themselves in Dublin in 838, when they built a fortified area, or longphort, there. During the tenth century Viking Dublin developed into the Kingdom of Dublin—a thriving town and a large area of the surrounding countryside, whose rulers controlled extensive territories in the Irish Sea and, at one time, York. Dublin was closely involved in the affairs of the Kingdom of the Isles, which included the Isle of Man and the Hebrides, and when the Dublin king Amlaíb Cuarán was defeated by Máel Sechnaill mac Domnaill at the Battle of Tara in 980, he was supported by the men of the Isles. Amlaíb's son, Sigtrygg Silkbeard, who was king of Dublin from 990, allied himself with his uncle Máel Mórda mac Murchada, king of Leinster. They met Máel Sechnaill and Brian Boru at the Battle of Glenmama in 999, where they were defeated.
From the time of the seventh-century king Domnall mac Áedo, the kingship of Tara, which was strongly associated with the high kingship of Ireland, had been held by members of the Uí Néill dynasty, which controlled the northern half of Ireland. In the tenth century, the Dál gCais, until then a small kingdom in what is now County Clare, began to expand. By the time of his death in 951, Cennétig mac Lorcáin had become king of Thomond. His son, Mathgamain mac Cennétig, was king of Munster when he died in 976. Mathgamain's brother, Brian Boru, quickly asserted his claim to the kingship of Munster, then invaded Leinster and gained its submission. In 998 he attacked the Uí Néill stronghold of Meath. Máel Sechnaill responded by attacking Munster in 999, and over the following years the two kings struggled for supremacy in Ireland. In 997, Brian and Máel Sechnaill met in Clonfert and reached an agreement where they recognised each other's reign over their respective halves of the country—Máel Sechnaill in the north and Brian in the south. Brian received the hostages of Leinster and Dublin from Máel Seachnaill, and surrendered the hostages of Connacht to him. The peace was short-lived. After they had jointly defeated the Vikings at Glenmama, Brian resumed his attacks on Máel Seachnaill. He marched on Tara in 1000 with the combined armies of Munster, Osraige, Leinster and Dublin, but after an advance party consisting of the latter two groups was destroyed by Máel Sechnaill, Brian Boru withdrew from the area without giving battle. In 1002 he marched with the same army to Athlone, and took the hostages of Connacht and Meath. He was now undisputed high king of Ireland.
Revolt of Dublin and Leinster
Brian consolidated his hold on Ireland by eventually obtaining the submission of the northern kingdoms of Cenél nEógain, Cenél Conaill and Ulaid, following a series of circuits of the northern part of the island. He completed the task when, following "a great hosting...by land and sea" into the Uí Néill territory of Cenél Conaill in 1011, the king was brought south to Dál Cais territory to submit to Brian Boru in person at his royal site of Cenn Corad. It was not long, however, before fighting was renewed. Flaithbertach Ua Néill, king of the Cenél nEógain resented the rise of Brian Boru. Had the old political order persisted, Flaithbertach would have been in line to succeed to the high-kingship. He attacked his Cenél Conaill neighbours in 1012 but while doing so Máel Seachnaill attacked the Cenél nEógain inauguration site of Tullyhogue. But Flaithbertach in turn raided into Meath the following year and Máel Seachnaill was forced to back down. Sigtrygg and Máel Mórda took advantage, and themselves raided Meath. Máel Seachnaill sent his army down to raid the hinterland north of Dublin as far as Howth but he was defeated. He lost two hundred men including his son Flann. Sigtrygg then sent a fleet down around the coast to attack the Munster town of Cork, but that was defeated, and Sygtrygg's nephew was killed. A full-scale conflict was inevitable. Brian brought his army to Leinster in 1013, and camped outside Dublin from September until the end of the year. Sigtrygg went overseas in search of support and enlisted the help of Sigurd Hlodvirsson, the Earl of Orkney and Brodir, a warrior of the Isle of Man. According to the Icelandic Njáls saga, Sigtrygg promised both men and the Kingdom of Ireland. The Viking fleets of Orkney and Man sailed into Dublin in Holy Week 1014. Brian mustered the army of Munster, which was joined by two Connacht kings, Mael Ruanaidh Ua hEidhin, King of Uí Fiachrach Aidhne, and Tadhg Ua Cellaigh, king of Uí Maine, and marched on Dublin. 
No order of battle is given in the contemporary sources; the only leaders named are those who died in the battle. The closest contemporary accounts are the Annals of Inisfallen and the Annals of Ulster. Among the fallen on Brian's side, they name the high king himself, his son Murchad and his grandson Toirdelbach, as well as his nephew Conaing, Domnall mac Diarmata of Corcu Baiscind (County Clare), Mac Bethad mac Muiredaig of Ciarraige Luachra (County Kerry), Mael Ruanaidh Ua hEidhin of Uí Fiachrach Aidhne, and Tadhg Ua Cellaigh of Uí Maine (both in south Connacht). On the opposing side are named Máel Morda, Dubgall mac Amlaíb, brother of Sigtrygg of Dublin, Sigurd Hlodvirsson of Orkney, Gilla Ciaráin mac Glún Iairn, probably a nephew of Sigtrygg, and Brodir, commander of the Viking fleet. No notables from Mide are recorded among the slain leading to the suggestion that, if present, Máel Sechnaill kept himself and his forces out of harm's way. But the Annals of Ulster say that Máel Sechnaill and Brian rode together to Dublin, and the Annals of the Four Masters go so far as to say that it was Máel Sechnaill won the day, and completed the rout after the death of Brian. Cogad Gáedel re Gallaib, on the other hand, says that the men of Meath came to the muster with Brian, but "were not faithful to him".
According to the Cogad, after his arrival at Dublin, Brian sent his forces north across the river to plunder the area known as Fine Gall, and they torched the country as far as Howth. Brian, now in his 70s, did not go with them but remained behind to pray. The Dublin forces set out by land, and were joined in Clontarf at high tide by the Viking fleet that was in Dublin Bay.
The front line of the Dublin/Leinster forces were the foreign Vikings, led by Brodir, Sigurd and a man called Plait, described as "the bravest knight of all the foreigners". Behind them were the men of Dublin, commanded by Dubgall mac Amlaíb and Gilla Ciaráin mac Glún Iairn. Behind them again came the Leinstermen, headed by Máel Mórda. Sigtrygg remained in Dublin with sufficient men to defend it, in the event the battle went against them. He watched the battle from the walls with his wife Sláine, the daughter of Brian.
At the front of Brian's forces were the Dál gCais, led by Brian's son Murchad, Murchad's 15-year-old son Toirdelbach, Brian's brother Cudulligh and Domnall mac Diarmata of Corcu Baiscind. Behind them were the other forces of Munster, commanded by Mothla mac Domnaill mic Fáeláin, king of the Déisi Muman, and Magnus mac Amchada, king of Uí Liatháin. Next came the Connacht Battalion, led by Mael Ruanaidh Ua hEidhin and Tadhg Ua Cellaigh. To one side of them were Brian's Viking allies; Fergal ua Ruairc, with the Uí Briúin and the Conmhaícne was placed on the left flank. Next after the Connachtmen came Máel Sechnaill and the men of Meath, but (the Cogad says) he had made an agreement with the men of Dublin that if he would not attack them, they would not attack him.
The battle opened with Plait taunting Domnall mac Eimin, a Scottish ally of Brian. The two men marched out into the middle of the field and fought, and both died, "with the sword of each through the heart of the other, and the hair of each in the clenched hand of the other."
Then the battle proper got under way. It is described in the Cogad as remarkably loud and bloody. The men of Connacht engaged with the men of Dublin, and the fighting was so fierce that only 100 Connachtmen survived, and only twenty of their opponents. The last casualties occurred at "Dubgall's Bridge", which Seán Duffy suggests was a bridge over the River Tolka, on the road back to Dublin. Brian's son Murchad, at the head of the Dál gCais army, took on the foreign Vikings, and, according to the Cogad, he himself killed 100 of the enemy—fifty with the sword in his right hand and fifty with the sword in his left. The Vikings wore mail; the Irish did not. Yet the Irish gained the advantage, partly through the use of small spears, which they hurled at the enemy, and partly though numerical superiority.
The battle, which had begun at first light, lasted the entire day. Eventually, the Dublin/Leinster forces broke, and some retreated back towards their ships, while others made for a nearby wood. However, the tide had come in again, cutting off the passage to the wood, but also carrying off the Viking ships. With no escape route, they were killed in large numbers, many of them by drowning. Samuel Haughton, in 1860, calculated that the tide at Clontarf would have been high at 5:30 am and again at 5:55 pm, which is consistent with the account in the Cogad. It was at this point that Brian's grandson Toirdelbach was killed. He pursued the enemy into the sea, but was hit by a wave and thrown up against the weir, and drowned. Murchad killed Sigurd, the earl of Orkney, but shortly afterwards he himself was killed. Brian was in his tent praying when Brodir found him, and killed him. Brodir was also killed.
Brian's body was brought to Swords, north of Dublin. There it was met by the coarb of Patrick, the traditional head of the church in Ireland, who brought the body back with him to Armagh, where it were interred after twelve days of mourning. Along with Brian were the body of Murchad and the heads of Conaing, Brian's nephew, and Mothla, king of the Déisi Muman. Máel Sechnaill was restored as high king of Ireland, and remained secure in his position until his death in 1022.
Though the Annals imply that life was not much changed after the death of Brian Boru, it created a succession crisis, as Brian's son and heir Murchad had died as well. Brian had two remaining sons who could challenge for the kingship: Donnchad mac Briain, his son with Gormflaith and Tadc mac Briain, his son with Echrad. According to the annals Donnchad rallied the forces of the Dál Cais at Clontarf and lead them home to Cenn Corad.
Within weeks the Dál Cais armies, under the new leadership of Donnchad, were battling their old masters the Eóganacht Raithlind. Tadc initially joined with his brother against the Eóganacht, but would eventually be killed in 1023 at the order of Donnchad.
Sigtrygg remained king of Dublin until 1036, and was apparently secure enough to go on pilgrimage to Rome in 1028. The fact was, however, that after Clontarf Dubin had been reduced to a subsidiary power. In 1052, Diarmait mac Máel na mBó, king of Leinster, captured Dublin and Fine Gall, for the first time asserting Irish overlordship over the Norse of Ireland.
- Battle of Confey
- Battle of Tara
- Brjáns saga
- Njál's saga, which includes a section on the Battle of Clontarf.
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