Fiachnae mac Áedo Róin

His father had been slain in battle in 735 by the High King of Ireland Áed Allán (died 743) of the Cenél nEógain and the kingship of Ulaid passed to the rival Dál nAraidi of southern County Antrim in the person of Cathussach mac Ailello (died 749). However, in 749 Cathussach was killed at Ráith Beithech (Rathveagh, modern County Antrim) probably in the interest of the Dál Fiatach and Fiachnae's brother, Bressal, became king.Annals of Ulster, AU 749.1; Mac Niocaill, pg. 137 Bressal himself was killed in 750 but the Dál Fiatach retained the kingship.AU 750.10, Mac Niocaill, pg. 137 The historian Professor Byrne, however, believes that it is probable there was an interregnum in Ulaid between the reigns of Áed Róin and Fiachnae.Byrne, pg. 118

Fiachnae restored the fortunes of the Dál Fiatach during his long reign. In 759 he became involved in a dispute among the churchmen of Armagh. Fiachnae supported the abbot Fer-dá-Chrích versus a priest named Airechtach who had the support of Dúngal mac Amalgado of the Uí Néill of Brega. Fiachnae defeated them at the Battle of Emain Macha, near Armagh, and Dúngal and his ally Donn Bó mac Con Brettan, king of Fir Rois were slain.Annals of Ulster, AU 759.2; Annals of Tigernach, 759.2; Byrne, pg. 118; Mac Niocaill, pg. 139

In 761 Fiachnae defeated the Uí Echach Cobo (a branch of the Dál nAraidi) of the west part of county Down in the Battle of Áth Duma where their king Ailill mac Feidlimid was slain.AU 761.2; AT 761.1; Mac Niocaill, pg. 139 The Uí Echach Coba were to suffer another defeat in 776 this time at the hands of the Airthir (an Airgialla tribe of modern County Armagh).AU 776.9; Mac Niocaill, pg. 139

The Dál nAraidi proper engaged in internecine civil wars in 776 and 783. In one of these conflicts in 776 Fiachnae's son Eochaid gave support to the claimant Tommaltach mac Indrechtaig (died 790) and they defeated and slew the ing of Dál nAraidi, Cinaed Ciarrge mac Cathussaig, and his ally Dúngal, king of the Uí Tuirtri (an Airgialla tribe west of Lough Neagh) in the Battle of Drong.AU 776.7; Mac Niocaill, pg. 139

The power of Fiachnae was such that the high king Donnchad Midi (died 797) sought a conference with him at Inis na Ríg in eastern Brega. However, mutual distrust prevented Fiachnae from coming ashore and Donnchad from going out to sea to meet him.AU 784.8; Mac Niocaill, pg. 139; Byrne, pg. 124 The purpose of the meeting may have been to deliminate spheres of influence. Donnchad may have been seeking to settle affairs involving the Uí Echach Coba and Airthir and the border region of the Conailli Muirtheimne (in modern County Louth).Mac Niocaill, pg. 139-140

The expansion of the Dál Fiatach northwards to the shores of Lough Neagh began in his reign and this cut off the Dál nAraidi proper from their kinsmen the Uí Echach Coba in the south. Fiachnae also gave his patronage to Bangor, traditionally a Dál nAraidi monastery.Byrne, pg. 119; Ó Cróinín, pg. 220 He also converted Downpatrick into a royal monastery (or this was done by his father).Byrne, pg. 119, 124 The first recorded abbot of Downpatrick in the annals has a death notice in 753.AU 753.6; Byrne, in A New History of Ireland, pg. 679

His sons Eochaid mac Fiachnai (died 810) and Cairell mac Fiachnai (died 819) were Kings of Ulster. Another son, Loingsech mac Fiachnai (died 800) was abbot of Downpatrick.Byrne, pg. 124; Ó Cróinín, pg. 220 Fiachnae's nephew Diarmait Ua Áedo Róin (died 825) was a Céli Dé (Culdee) church reformer and founded the monastery of Diseart Diarmad (Castledermot, modern County Kildare) in 812 renewing the ties of Bangor with Leinster.Byrne (NHI), pg. 679

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• Annals of Ulster at [http://www.ucc.ie/celt/published/T100001A/index.html] at [http://www.ucc.ie/ University College Cork]
• Annals of Tigernach at [http://www.ucc.ie/celt/published/G100002/index.html] at [http://www.ucc.ie/ University College Cork]
• Byrne, Francis John (2001), Irish Kings and High-Kings, Dublin: Four Courts Press, {{ISBN|978-1-85182-196-9}}
• Charles-Edwards, T. M. (2000), Early Christian Ireland, Cambridge: Cambridge University Press, {{ISBN|0-521-36395-0}}
• Mac Niocaill, Gearoid (1972), Ireland before the Vikings, Dublin: Gill and Macmillan
• Ó Cróinín, Dáibhí (2005), A New History of Ireland, Volume One, Oxford: Oxford University Press

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• [http://celt.ucc.ie/index.html CELT: Corpus of Electronic Texts] at [http://www.ucc.ie/ University College Cork]

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Category:Kings of Ulster

Category:789 deaths

Category:8th-century Irish monarchs

Category:Year of birth unknown