Clann Cholmáin is the name of the dynasty descended from Colmán Mór (Colmán Mór mac Diarmata), son of Diarmait mac Cerbaill

Diarmait mac Cerbaill

Diarmait mac Cerbaill was King of Tara or High King of Ireland. According to traditions, he was the last High King to follow the pagan rituals of inauguration, the ban-feis or marriage to goddess of the land....

. Part of the Southern Uí Néill

Uí Néill

The Uí Néill are Irish and Scottish dynasties who claim descent from Niall Noigiallach , an historical King of Tara who died about 405....

 — they were the kings of Mide

Kings of Mide

In medieval Ireland, the Kings of Mide were of the Clann Cholmáin, a branch of the Uí Néill. Several were High Kings of Ireland. After the collapse of the kingdom in the 12th century its dynasty, the Ua Mael Sechlainn or Ó Melaghlins, were forced west and settled on the east bank of the Shannon...

 (Meath) — they traced their descent to Niall Noígiallach

Niall of the Nine Hostages

Niall Noígíallach , or in English, Niall of the Nine Hostages, son of Eochaid Mugmedón, was an Irish king, the eponymous ancestor of the Uí Néill kindred who dominated Ireland from the 6th century to the 10th century...

 and his son Conall Cremthainne

Conall Cremthainne

Conall Cremthainne , also called Conall Err Breg, was an Irish king. He was the son of Niall of the Nine Hostages, and one of the progenitors of the Uí Néill dynasty....

.

Related dynasties descended through Conall Cremthainne and Diarmait mac Cerbaill included the Síl nÁedo Sláine

Síl nÁedo Sláine

Síl nÁedo Sláine is the name of the descendants of Áed Sláine , son of Diarmait mac Cerbaill. Part of the Southern Uí Néill—they were the kings of Brega—they claimed descent from Niall Noígiallach and his son Conall Cremthainne....

, the kings of Brega

Kings of Brega

-Overview:Brega took its name from Mag Breg, the plain of Brega, in modern County Meath, County Louth and County Dublin, Ireland. They formed part of the Uí Néill kindred, belonging to the Síl nÁedo Sláine branch of the southern Uí Néill. The kingdom of Brega included the Hill of Tara, the site...

, descended from Colmán Már's youngest brother Áed Sláine

Áed Sláine

Áed mac Diarmato , called Áed Sláine , was the son of Diarmait mac Cerbaill. Legendary stories exist of Áed's birth. Saint Columba is said to have prophesied his death...

, and the less important Clann Cholmáin Bicc (or the Caílle Follamain), descendants of the middle brother, Colmán Bec

Colmán Bec

Colmán mac Diarmato was an Irish king, son of Diarmait mac Cerbaill. Early sources and older scholarship distinguish two sons of Diarmait, Colmán Bec and Colmán Már , although it is now supposed that only Colmán Bec was a historical figure, Colmán Már being a later genealogical invention...

. The Kings of Uisnech

Kings of Uisnech

The Kings of Uisnech were of the Uí Néill and one of its major southern branches, the Clann Cholmáin. The Hill of Uisnech is located in what is now County Westmeath, and was in early historic Ireland considered as the area where all five provinces met....

, among others, belonged to Clann Cholmáin.

Important kings of Clann Cholmáin included:

• Domnall Midi
  Domnall Midi
  Domhnall Mac Murchada , called Domnall Midi , was High King of Ireland. He belonged to the Clann Cholmáin branch of the Uí Néill...
  
   (died 763)
• Donnchad Midi mac Domnaill
  Donnchad Midi mac Domnaill
  Donnchad mac Domnaill , called Donnchad Midi, was High King of Ireland. His father, Domnall Midi, had been the first Uí Néill High King from the south-central Clann Cholmáin based in modern County Westmeath and western County Meath, Ireland...
  
   (died 797)
• Máel Sechnaill mac Maíl Ruanaid
  Máel Sechnaill mac Maíl Ruanaid
  Máel Sechnaill mac Máele Ruanaid was High King of Ireland. The Annals of Ulster use the Old Irish title rí hÉrenn uile, that is "king of all Ireland", when reporting his death, distinguishing Máel Sechnaill from the usual Kings of Tara who are only called High Kings of Ireland in late sources such...
  
   (died 862)
• Flann Sinna
  Flann Sinna
  Flann Sinna was the son of Máel Sechnaill mac Máele Ruanaid of Clann Cholmáin, a branch of the southern Uí Néill. He was King of Mide from 877 onwards and is counted as a High King of Ireland...
  
   (died 916)
• Máel Sechnaill mac Domnaill
  Máel Sechnaill mac Domnaill
  Máel Sechnaill mac Domnaill , also called Máel Sechnaill Mór, Máel Sechnaill II, anglicized Malachy II, was King of Mide and High King of Ireland...
  
   (died 1022)