Seanach Garbh (died 620) was Abbot of Clonfert.
Seanach is the second recorded abbot, including Brendan. Few details of his life appear to be known, and over one hundred years would pass before another abbot was recorded. Events during his lifetime included:
Flaithbertach mac Loingsig was a High King of Ireland. He was a member of the Cenél Conaill, a branch of the northern Uí Néill. He was the son of Loingsech mac Óengusso, a previous high king. He ruled from 728 to 734.
Fráech mac Finchada or Fróech mac Findchado was a king of Leinster. Fráech was a member of the Dál Messin Corb dynasty's principal sub-sept, the Uí Garrchon. He succeeded his father, Fincath mac Garrchu,. He ruled from 485 to 495.
Ainmuire mac Sétnai or Ainmire or Ainmere was a High King of Ireland from the Cenél Conaill branch of the Uí Néill. He was the great-grandson of Conall Gulban, founder of this branch. He ruled from 566 to 569. He was the first high king from the Cenél Conaill.
Colmán mac Cobthaig was a king of Connacht from the Ui Fiachrach. He was the first king of Connacht from the Ui Fiachrach Aidhne branch. This branch was descended from Eochu, the brother of Ailill Molt. According to the Book of Ballymote he was the grandson of Goibnenn mac Conaill (flor.537), the first Aidne king mentioned in the annals, but Rawlinson Genealogies name his grandfather as Gabrán.
Faílbe Flann mac Áedo Duib was a King of Munster from the Eóganacht Chaisil branch of the Eoganachta. He succeeded Cathal mac Áedo Flaind Chathrach of the Glendamnach branch in 628. He was the younger brother of a previous king Fíngen mac Áedo Duib. His sobriquet Flann meant "blood-red".
Crimthann mac Énnai was a King of Leinster from the Uí Cheinnselaig sept of the Laigin. He was the son of Énnae Cennsalach, the ancestor of this dynasty.
Crimthann mac Áedo was a King of Leinster from the Uí Máil branch of the Laigin. He was the son of Áed Dibchine mac Senaig, a previous king. He would have succeeded sometime after the death of Rónán mac Colmáin. His brother Rónán Crach was possibly the Leinster king mentioned in the saga "Fingal Rónáin" and is also said to have been a bishop who was slain by Crimthann.
Dúnchad mac Murchada was a King of Leinster from the Uí Dúnlainge branch of the Laigin. He was the son of Murchad mac Brain Mut, the previous king. He ruled from 727 to 728.
Suibne mac Colmáin was a King of Uisnech in Mide of the Clann Cholmáin. He was the son of Colmán Már mac Diarmato, also King of Uisnech. He ruled Uisnech from 587 to 600.
Fergus mac Colmáin was a King of Uisnech in Mide, Ireland, of the Clann Cholmáin. He was the son of Colmán Már mac Diarmato and brother of Suibne mac Colmáin, also kings of Uisnech. He ruled Uisnech from 600 to 618.
Congal mac Áedo Sláine was a King of Brega from the Síl nÁedo Sláine branch of the southern Ui Neill. He was the son of the high king Áed Sláine mac Diarmato.
Ailill Cruitire mac Áedo Sláine was a King of Brega from the Síl nÁedo Sláine branch of the southern Ui Neill. He was the son of the high king Áed Sláine mac Diarmato. His byname meant "harper".
Máel Dóid mac Suibni was a King of Uisnech in Mide of the Clann Cholmáin. He was the son Suibne mac Colmáin and brother of Conall Guthbinn mac Suibni, previous kings. He ruled from 635 to 653.
Dúngal mac Amalgado was a King of Brega from the Uí Chonaing sept of Cnogba (Knowth) of the Síl nÁedo Sláine branch of the southern Ui Neill. He was the son of Amalgaid mac Congalaig and brother of Conaing mac Amalgado, previous kings. He ruled from 748 to 759.
Goibnenn mac Conaill was the first king of the Ui Fiachrach Aidhne mentioned in the annals. He was the great-grandson of the high king Nath Í.
Crundmáel mac Suibni was a King of Ailech and head of the Cenél nEógain branch of the northern Uí Néill. He was the son of the high king of Ireland Suibne Menn. According to the Laud Synchronisms he succeeded his uncle Ernaine mac Fiachnai and ruled for 24 years which gives a possible reign of 636-660 as King of Ailech.
Cellach mac Fáelchair or Cellach Raigni was a King of Osraige in modern County Kilkenny. He was the son of Fáelchar Ua Máele Ódrain, a previous king.
Brenainn mac Cairbre, 12th King of Uí Maine, died 597 or 601.
Mughron Ua Níoc was Abbot of Tuam.
Nuada ua Bolcain was Abbot of Tuam.