Battle of Clontarf
Battle of Clontarf
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Battle of Clontarf

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Battle of Clontarf

The Battle of Clontarf (Irish: Cath Chluain Tarbh) took place on 23 April 1014 at Clontarf, near Dublin, on the east coast of Ireland. It pitted an army led by Brian Boru, High King of Ireland, against a Norse-Irish alliance comprising the forces of Sigtrygg Silkbeard, King of Dublin; Máel Mórda mac Murchada, King of Leinster; and a Viking army from abroad led by Sigurd of Orkney and Brodir of Mann. It lasted from sunrise to sunset, and ended in a rout of the Viking and Leinster armies.

It is estimated that between 7,000 and 10,000 men were killed in the battle, including most of the leaders. Although Brian's forces were victorious, Brian himself was killed, as were his son Murchad and his grandson Toirdelbach. Leinster king Máel Mórda and Viking leaders Sigurd and Brodir were also slain. After the battle, the power of the Vikings and the Kingdom of Dublin was largely broken.

The battle was an important event in Irish history and is recorded in both Irish and Norse chronicles. In Ireland, the battle came to be seen as an event that freed the Irish from foreign domination, and Brian was hailed as a national hero. This view was especially popular during the period of British rule in Ireland. Although the battle has come to be viewed in a more critical light, it still has a hold on the popular imagination.

The Vikings (or Norsemen) began carrying out raids on Gaelic Ireland in the late eighth century, and over the following few decades they founded a number of settlements along the coast. 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. Over time, many Vikings were assimilated into Gaelic society and became the Norse-Gaels. 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 mac Domnaill and Brian Boru at the Battle of Glenmama in 999, where they were defeated.

From the time of the seventh century and the reign of Domnall mac Áedo, the kingship of Tara was a title which was strongly associated with the high kingship of Ireland and was held by members of the Uí Néill dynasty, who 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 the undisputed High King of Ireland.

Brian consolidated his hold on Ireland by eventually obtaining the submission of the northern territories 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 gCais 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 Tullahoge. Flaithbertach in turn raided Meath the following year and Máel Sechnaill was forced to back down. Sigtrygg and Máel Mórda took advantage, and themselves raided Meath. Máel Sechnaill sent his army 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 along the coast to attack the Munster town of Cork, but that was defeated, and Sigtrygg'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 Viking 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 the kingship of Ireland if they defeated Brian. In early 1014, Sveinn Forkbeard, King of Denmark, had invaded and become the first Norse king of England.

The Viking fleets of Orkney and Mann sailed into Dublin in Holy Week 1014. Brian mustered the army of Munster, which was joined by Máel Sechnaill and two Connacht kings, Mael Ruanaidh Ua hEidhin, King of Uí Fiachrach Aidhne, and Tadhg Ua Cellaigh, King of Uí Maine, and they marched on Dublin.

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