Lughaidh mac Dallán
Lughaidh mac Dallán, 7th king of Uí Maine, fl. 5th-century/6th-century. John O'Donovan remarked that "Lughaidh, the son of Dallan, and brother of Duach, was prince or chief ruler of Hy-Many for fourteen years, when he died a  natural death. References

 http://www.rootsweb.ancestry.com/~irlkik/ihm/uimaine.htm
 Annals of Ulster at CELT: Corpus of Electronic Texts at University College Cork
 Annals of Tigernach at CELT: Corpus of Electronic Texts at University College Cork
 Revised edition of McCarthy's synchronisms at Trinity College Dublin. Irish Kings and High-Kings, Francis John Byrne, Dublin (1971;2003) Four Courts Press, 
 History of the O'Maddens of Hy-Many, Gerard Madden, 2004. . The Life, Legends and Legacy of Saint Kerrill: A Fifth-Century East Galway Evangelist by Joseph Mannion, 2004. 
 http://www.ucc.ie/celt/published/G105007/index.html

Nobility from County Galway
Nobility from County Roscommon
5th-century Irish monarchs
Kings of Uí Maine