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Uí Sihtric (999–1168)

Main article: Uí Sihtric

The Uí Sihtric dynasty was a Hiberno-Norse noble family and a cadet branch of the Uí Ímair clan of the British Isles. The Uí Ímair had ruled Dublin for half a century, but came to dominate Ireland upon King Sigtrygg Silkbeard's victory over Máel Sechnaill, High King of Ireland in 999, claiming sovereignty over the island. Eventually, Sigtrygg Silkbeard was crowned King of Ireland by Pope Sylvester V. The Uí Sihtric suffered from a disputed succession after the death of King Olaf Sigtryggsson, eventually sparking a brutal war of succession known as the Hundred Kings War. The last Uí Sihtric King, Sven Olafsson was exiled to Vinland together with many of his kinsmen, which they ruled until the establishment of the Principality of Vinland.

Portrait	Name	King from	King until	Death	Relationship with predecessor(s)	Title
	Sigtrygg Silkbeard	3 November 1032	8 June 1039	Died of suspicious circumstances, aged 69.	• Counterpartner of Máel Sechnaill, High King of Ireland and King of Mide (980-999)	King of Dublin and Ireland
	Olaf Sigtryggsson the Disinterested	8 June 1039	30 March 1073	Died of natural causes, aged 78.	• Son of Sigtrygg Silkbeard
	Koll Sigurdsson	24 August 1073	17 January 1073	Killed by Conchobar Ua Conchobair, King of Meath in 1121.	• Nephew of Olaf Sigtryggsson
	Ralof Sigurdsson	28 July 1077	20 April 1080	Died of natural causes, aged 65.	• Uncle of Koll Sigurdsson  • Cousin of Olaf Sigtryggsson	King of Ireland
non-contemporary	Sven Olafsson	20 June 1135	6 October 1158	Died en route to Vinland, aged 85.	• Illegitimate child of Olaf Sigtryggsson

Uí hEodhusa (1181–1259)

Main article: Uí hEodhusa

The Uí hEodhusa were a group of minor Hiberno-Norse nobles based in Dublin, and distant relatives of their preceding Uí Sihtrics and Uí Ímairs. The Uí Ímair came to power in the wake of the brutal Hundred Kings War, during which they took control of much of Eastern Ireland with the help of Norman and Moorish mercenaries that their founder, Osvald Linisson had recruited from abroad. The Uí hEodhusa were challenged by native Gaelic lords Domnhall Caomhánach of Leinster and Brian Conchobair of Munster for lordship of Ireland. After a brief cultural flowering in the early reign of Ivarr Magnusson, the authority of Uí hEodhusa monarchs collapsed after the Sigurd Rebellion, and the Kingship was usurped by Moorish general Eoin O Hiamad.

Portrait	Name	King from	King until	Death	Relationship with predecessor(s)	Title
	Osvald "Al-Hassan" Linisson	17 August 1181	26 June 1201	Died of battle injuries, aged 53.	• Grandson-in-law of Koll Sigurdsson.	King of Dublin and Ireland
	Magnus Osvaldsson the Axe	1 July 1201	30 March 1221	Died of natural causes, aged 48.	• Son of Osvald "Al-Hassan" Linisson
	Ivarr Magnusson the Recluse	7 April 1221	11 March 1263	Died of posioning, aged 61.	• Son of Magnus Osvaldsson
	Sigurd Magnusson the Strong	4 April 1256	19 November 1259	Executed by Eoin O Hiamad, aged 47.	• Son of Magnus Osvaldsson  • Brother of Ivarr Osvaldsson	Count of Wexford and King of Ireland

Uí Gaídel (1263–0000)

Main article: Uí Gaídel

The Uí Gaídel were a Hiberno-Moorish family that first arrived in Ireland to fight for Osvald Linnson during the Hundred Kings War. The family grew in prominence as Moorish mercenaries became the backbone of Irish military might, embedded itself into the Hiberno-Norse nobility in the early 13th century, eventually making the office of Lord-Protector of Ireland during the Sigurd Rebellion. General Eoin O Hiamad became King of Ireland upon Ivarr Magnusson's death, and opened the floodgates to Moorish influence. Eoin O Hiamad grew to be paranoid and craven, and soon grew to be hated by many in Ireland.

The Uí Gaídel were briefly interrupted by a Uí hEodhusa restoration under Laurent de Dreux, and resumed their rule in 1310. The Dreuxist Rebellion prompted Seosamh Eoinson to pursue a strong Gaelicisation campaign, forcing his Moorish, French and Norman Lords to adopt native Irish practices in the name of cultural unity. The Uí Gaídel are therefore sometimes known as the "first popular monarchy".

Portrait	Coat of arms	Name	King from	King until	Relationship with predecessor(s)	Death	Title
		Eoin Hiamadson the Egocentric, the Craven	2 January 1263	20 July 1287	• Son-in-law of Ivarr Osvaldsson	• Died of choking, aged 60. Buried in the Cathedral of the Holy Trinity.	King of Dublin and Ireland
		Seosamh Eoinson the Gael	20 July 1287	4 August 1343	• Son of Eoin Hiamadson

Uí Dreux (1298–1310)

Main article: Laurent de Dreux

With the death of the much-feared Eoin O Hiamad, various Uí hEodhusa restorationists began to gather in strength, most powerful of which was the Uí Dreux. The young Laurent de Dreux was the most powerful vassal of the French King Philippe III, and now sought to expand his power beyond the borders of France by claiming his right to the succession of the Irish throne as the last of the Uí hEodhusa who had yet to accept Uí Gaídel rule. Laurent landed in Port Láirgeand marched on Dublin, sparking the Dreuxist Rebellion. Laurent de Dreux was ultimately defeated, and Uí Gaídel rule resumed.

Portrait	Coat of arms	Name	King from	King until	Relationship with predecessor(s)	Title
		Laurent de Dreux	2 October 1298	31 May 1310	• Great-grandson of Magnus Osvaldsson	Count of Dreux, Count of Flanders, Duke of Brittany and King of Ireland

Uí Gaídel Restored (1263–0000)

Main article: Uí Gaídel

Portrait	Coat of arms	Name	King from	King until	Relationship with predecessor(s)	Title
		Seosamh Eoinson the Gael	20 July 1287	4 August 1343	• Son of Eoin Hiamadson	King of Dublin and Ireland
		Toirdelbach O'Seosamh the Tall	31 May 1310	7 November 1342	• Son of Seosamh Eoinson
		Conchobar O'Toirdelbach the Seafarer	7 November 1342	5 February 1384	• Son of Toirdelbach O'Seosamh	King of Dublin and Ireland, Lord of Vinland, Lord of An Íoslainn
		Sléibhín O'Conchobar the Wealthy	5 February 1384	13 September 1444	• Son of Conchobar O'Toirdelbach