Fergus I ()
Fergus I's father is
Fiachra ()
. His paternal grandfather is
Angus II Tuirimheach
. He is an only child.
Ancestor Pedigree Chart
Conla Cruaich Cealgach ()
*
Oiliolla Caisfhiaclach ()
Eochaidh II ()
Angus II Tuirimheach
Fiachra ()
Fergus I ()
*
There are earlier generations for the ancestor(s) indicated. See their page(s) for details (click name)
Fergus I's family
He has a biological son named
Manius
.
Children
Manius ()
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Fergus I () 
Fergus I ()