dˈʌɡən ɪz səpˈoʊzd tə hɐvbɪn ɐ dᵻɹˈɛkt dᵻsˈɛndənt ʌv mˈɑːɡ ɹˈuːθ ænd ɐ dˈʌɡən, kˈɪŋ ʌv fˈɜːmɔɪ, wʌz wˈʌn ʌv bɹˈaɪən bˈoːɹuːz luːtˈɛnənts təbi kˈɪld æt ðə bˈæɾəl ʌv klˈɔntɑːɹf.
Duggan is supposed to have been a direct descendant of Mogh Ruith and a Duggan, King of Fermoy, was one of Brian Boru's lieutenants to be killed at the battle of Clontarf.