Dúngal mac Fergaile (sometime Dúnlang mac Fergaile) was king of Osraige from 802 until his death in 842.U842.13
History Dúngal mac Fergaile was of the old Ossorian lineage called the Dál Birn, who traced their descent from Óengus Osrithe the first king of Osraige through his son and successor Loegaire Birn Buadach, of the second century.Book of Leinster, formerly Lebar na Núachongbála (Author:unknown) Section 29; folio 40e "Reges Ossairge" http://www.ucc.ie/celt/online/G800011A/ King Dúngal took the throne of Osraige after the death of his father, king Fergal mac Anmchada (K.O., d. 802) at a critical point in its history, just at the dawn of the Viking age in Ireland.U825.12 Dúngal mac Fergaile's long reign was part of a longer period of steady royal succession and political stability within the kingdom of Osraige.Early Irish Regnal Succession: A Case Study; by Jim Reid. https://www.academia.edu/6401329/Early_Irish_Regnal_Succession_A_Case_Study He is also noteworthy as being the father of two other kings of Osraige; Cerball mac Dúnlainge (K.O. 842-888), his successor whose fame is recounted in the Fragmentary Annals of Ireland and Riacan mac Dúnlainge (K.O. 888-894); as well as their sister, princess Land ingen Dúngaile, wife of the high king Máel Sechnaill mac Máele Ruanaid.FA 246
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References
Annals of Ulster at CELT: Corpus of Electronic Texts at University College Cork Book of Leinster,Reges Ossairge at CELT: Corpus of Electronic Texts at University College Cork Genealogies from Rawlinson B 502, compiled by Donnchadh Ó Corráin at CELT: Corpus of Electronic Texts at University College Cork
External links The Fitzpatrick – Mac Giolla Phádraig Clan Society