Eochaid Mugmedon ("slave-lord") was a semi-historical High King of Ireland of the 4th century who was said to be the ancestor of many of Ireland's most significant dynasties, such as the Connachta and the Ui Néill. The office of High King of Ireland (Irish: Ard Rí Érenn) was in origin a pseudohistorial construct of the eighth century that placed a king of all Ireland atop the fragmented pyramid of kingship that actually existed at that time. ... (3rd century - 4th century - 5th century - other centuries) As a means of recording the passage of time, the 4th century was that century which lasted from 301 to 400. ... The Uí Néill (Irish for grandsons (descendants) of Niall) were an Irish dynasty who claimed descent from Niall Noigiallach (Niall of the Nine Hostages), a semi-historical High King of Ireland who died about 450. ...

By his wife, Mongfind, he had sons Brion, Ailill and Fiachrae. By a slave he captured on a raid in Britain, Cairenn, he had a fourth son, Niall, later known as Niall Noigiallach (Niall of the Nine Hostages). In Irish mythology Ailill was king of Connacht and husband of Medb during the events of the Ulster Cycle. ...

Cáelbad (Cáelbhadh, Caolbhadh), a descendant of the legendary hero Conall Cernach, was a king of Ulster who became High King of Ireland in the 4th century. ... The High Kingship of Ireland was a pseudohistorical construct of the eighth century AD, a projection into the distant past of a political entity that did not become reality until the ninth century. ... Signature page from the Annals of the Four Masters Entry for A.D. 432 The Annals of the Four Masters or the Annals of the Kingdom of Ireland by the Four Masters are a chronicle of medieval Irish history. ... Seathrún Céitinn, known in English as Geoffrey Keating, was a 17th century Irish clergyman, poet and historian. ... Crimthann, son of Fidach, was a legendary king of Munster and High King of Ireland of the 4th century. ...

Family tree

 Conn Cétchathach | | Art mac Cuinn | | Cormac mac Airt | | Cairbre Lifechair | | Fiachu Sraibtine | | Muiredach Tirech | | Eochaid Mugmedon + Mongfind + Cairenn | | _________|_________ | | | | | | | | | Brion Fiachrae Ailill Niall (The Connachta) | __________________________|_______________________________________________________ | | | . | | | | | | | | . | | | | | Conall Gulban Endae Eogan . Coirpre Lóegaire Maine Conall Cremthainne Fiachu | . | | ________|________ | . | | | | Muirdeach . Cormac Caech Lughaid Fergus Cerrbel Ardgal | . | (d.507) | | . | | Muirchertach . Tuathal Diarmaid mac Ercae . Maelgarb mac Cearbhaill (d.536) . (d.544) (d.565) . (Northern Ui Néill) . (Southern Ui Néill) 

In Irish mythology, Conn Cetchatach or Conn of the Hundred Battles (c. ... Art mac Cuinn, aka Art Óenfer (the lone or solitary - he was the only one of his fathers many children to survive to adulthood), was a legendary High King of Ireland of the 2nd century. ... Cormac Mac Airt is probably the most famous of the ancient kings of Ireland, and is now thought to have been an authentic historical king. ... Cairbre Lifechair (lover of the Liffey), son of Cormac mac Airt, was a legendary High King of Ireland of the 3rd century. ... Niall Noigiallach or Niall of the Nine Hostages, semi-historical King of Ireland, thought to have flourished in the first half of the 5th century. ... Lóegaire (Loeguire, Láegaire, Laoghaire, sometimes anglicised as Leary), son of Niall of the Nine Hostages. ... Events Battle of Vouillé: Clovis I defeats the Visigoths near Poitiers, ends Visigothic power in Gaul. ... In Irish mythology and pseudohistory, Diarmaid mac Cearbhaill (Diarmait mac Cerbaill, Diarmuid mac Cerrbeóil, Dermot McKerval) of the southern Ui Néill clan was High King of Ireland ca. ... In Irish mythology and pseudohistory, Diarmaid mac Cearbhaill (Diarmait mac Cerbaill, Diarmuid mac Cerrbeóil, Dermot McKerval) of the southern Ui Néill clan was High King of Ireland ca. ... Events June 8 - St. ... Events Belisarius is sent back to Italy to once more fight the Ostrogoths who have been making reconquests in the area. ... Events January 22 - Eutychius is deposed as Patriarch of Constantinople by John Scholasticus. ... The Uí Néill (Irish for grandsons (descendants) of Niall) were an Irish dynasty who claimed descent from Niall Noigiallach (Niall of the Nine Hostages), a semi-historical High King of Ireland who died about 450. ... The Uí Néill (Irish for grandsons (descendants) of Niall) were an Irish dynasty who claimed descent from Niall Noigiallach (Niall of the Nine Hostages), a semi-historical High King of Ireland who died about 450. ...

References

• http://www.ucc.ie/celt/published/T100005A/index.html
• "Irish Kings and High Kings", Francis J. Byrne, Dublin, 1973.