Other Events and Attributes:

• Death: Northern Ireland
• Appointments / Titles: Chief of the O'Cahan of Keenaght, Fir-na-Creeve and Fir Lee
• Appointments / Titles: King of Ciannachta ... King of Keenaght
• FSID: L14D-DGL
• Military: 1264; Taken prisoner by Aedh the Tawny.

Notes:

Cumee na Gall O'Cahan (Irish: Cú Maighe na nGall Ó Catháin) was a chief of the O'Cahan of Keenaght, Fir-na-Creeve and Fir Lee in modern-day County Londonderry, Northern Ireland. The family first appears on record in 1138. Cumee was a son of Manus O'Cahan, a man who fell in battle alongside fourteen other members of the O'Cahan in support of Brian O'Neill, king of Tír Eoghain, at the battle of Druim Dearg.

Following his father's death, Cumee was made chief of his kindred by Henry de Mandeville, seneschal of Ulster, and thereupon served as an ally to this Anglo-Irish lord. His ties with the Normans earned him the epithet of na nGall meaning "of the foreigners".

Cumee's son, Dermot, appears on record in 1312. Cumee's daughter, Anna (Áine), married Angus Og MacDonald. A heavily restored effigy at Dungiven Priory is sometimes associated with Cumee, although it appears to date to the last quarter of the fifteenth century, and seems to be that of a later member of the kindred: perhaps either Godfrey (Gofraidh, died 1472), Dermot (Diarmait, died 1484), Godfrey (Gofraidh, died 1492), or Owen (Eóin, died 1492).
__________________________________________________

Magonius or Magnus O'Cahan Prince Of Limavady.

Manus Catha an Duin was a son of Rory Raudria O'Cathain [1][2] He was a prince of Limavady, killed by the English in the Battle of Down (Druim Dearg) in 1260.

He died in the year 1260 in Slain At Battle Of, Down, Ireland, he was 60 years old. The Battle of Druim Dearg, also known as the Battle of Down, took place on or about 14 May 1260 near Downpatrick, in modern-day County Down, Northern Ireland. [3]
Hence the epithet Catha an Duin MacNamee laments the loss of Magnus O'Cathain as being the most grievous after that of O'Neill himself.

Lament of the O'Cathain Loss

"Bitter to my heart (to see) the grey Galls Triumphing over the slaughtered Maghnus; That the head of O'Cathain, attracting no notice, Should be seen on the bridge of Dun.

At night did Maghnus of Macha remain Between wounded bodies; If Brian had not been in the slaughter There would be no loss like O'Cathain.

Maghnus himself, Eachmarcach too, Muircheartach, Dounchadh, Domhnall, And Niall O'Cathain all falling with wounds: Alas, it was not one loss only.

A misfortune to our children and our wives Was the slaying of Maghnus O'Cathain: That scion of Inbhear-Abhaigh never neglected A son or a daughter of Eoghan's race."[4]

Sources
↑ [1]
↑ Library Ireland : Princes of Limavady, County Londonderry
↑ https://www.wikiwand.com/en/Battle_of_Druim_Dearg
↑ http://ulsterman3.tripod.com/Battle_of_Down.htm
O'Cahan's Princes : Battle of Down
Magnus `Yellow-haired' (OCHAAN) O'CATHAIN
https://fabpedigree.com/s024/f350145.htm
Magnus `Yellow-haired' (OCHAAN) O'CATHAIN, Prince de LIMAVADY, D'Irlande
https://gw.geneanet.org/foullon?lang=en&pz=matheline+marie+herminia&nz=foullon&ocz=0&p=magnus+yellow+haired+ochaan+o+cathain+prince+de+limavady&n=d+irlande
Prince Magnus O'Cahan 1200–1260
https://ancestors.familysearch.org/en/LBRQ-SRQ/prince-magnus-o%27cahan-1200-1260

King of Keenaght a barony in County Londonderry
Below is a list of civil parishes in Keenaght:[13]

Aghanloo
Balteagh
Banagher (split with barony of Tirkeeran)
Bovevagh
Carrick
Drumachose
Dungiven
Magilligan (also known as Tamlaghtard)
Tamlaght Finlagan

Family/Spouse: O'Cathain, Aonghas of Islay. Aonghas was born in 1225 in Scotland; died in DECEASED. [Group Sheet] [Family Chart]

1. O'Cathain, Agnes MacDonald was born in 1270 in Limavidy, Londonderry, Northern Ireland; died in 1326 in Finlaggan Castle, Eilean Mór, Lock Finlaggan, Islay, Scotland.

Other Events and Attributes:

• Appointments / Titles: Limavidy, Londonderry, Northern Ireland; Prince of Limavadi
• Nickname: Yellow Haired
• FSID: GF1N-DXJ

Notes:

Magonius or Magnus O'Cahan Prince Of Limavady.

Manus Catha an Duin was a son of Rory Raudria O'Cathain [1][2] He was a prince of Limavady, killed by the English in the Battle of Down (Druim Dearg) in 1260.

He died in the year 1260 in Slain At Battle Of, Down, Ireland, he was 60 years old. The Battle of Druim Dearg, also known as the Battle of Down, took place on or about 14 May 1260 near Downpatrick, in modern-day County Down, Northern Ireland. [3]
Hence the epithet Catha an Duin MacNamee laments the loss of Magnus O'Cathain as being the most grievous after that of O'Neill himself.

Lament of the O'Cathain Loss

"Bitter to my heart (to see) the grey Galls Triumphing over the slaughtered Maghnus; That the head of O'Cathain, attracting no notice, Should be seen on the bridge of Dun.

At night did Maghnus of Macha remain Between wounded bodies; If Brian had not been in the slaughter There would be no loss like O'Cathain.

Maghnus himself, Eachmarcach too, Muircheartach, Dounchadh, Domhnall, And Niall O'Cathain all falling with wounds: Alas, it was not one loss only.

A misfortune to our children and our wives Was the slaying of Maghnus O'Cathain: That scion of Inbhear-Abhaigh never neglected A son or a daughter of Eoghan's race."[4]

Magnus married O'Cathain, Formaiel in 1240 in Northern Ireland. Formaiel was born in 1200 in Limavidy, Londonderry, Northern Ireland; died in 1260 in Northern Ireland; was buried in 1260 in Limavidy, Londonderry, Northern Ireland. [Group Sheet] [Family Chart]

Other Events and Attributes:

• FSID: LRQP-BNX

Notes:

The Life Summary of Formaiel
Formaiel O'Caithan was born in 1200, in Ulster, Ireland. She married Prince Magnus O'Cathain of Limavady about 1240, in Ulster, Ireland. They were the parents of at least 2 sons. She died in 1260, in her hometown, at the age of 60.

https://ancestors.familysearch.org/en/LRQP-BNX/formaiel-o%27caithan-1200-1260

Other Events and Attributes:

• Appointments / Titles: King of Formaeil
• FSID: M8KR-8X9

Notes:

The Life Summary of Rory
King Rory O'Cathain of Formaeil was born in 1175, in Ulster, Ireland as the son of King Donal Of Formaeil Cathain. He married Queen of Formaeil O'Cathain about 1195, in Ireland. They were the parents of at least 1 son. He died in his hometown.

https://ancestors.familysearch.org/en/G3M7-RCP/king-rory-o%27cathain-of-formaeil-1175

Rory married O'Cathain, Queen of Formaeil in 1195 in Ireland. Queen was born in 1175 in Ireland; died in DECEASED in Ireland. [Group Sheet] [Family Chart]

Other Events and Attributes:

• FSID: M8K1-VT5

Notes:

The Life Summary of Queen of Formaeil
Queen of Formaeil O'Cathain was born in 1175, in Ireland. She married King Rory O'Cathain of Formaeil about 1195, in Ireland. They were the parents of at least 1 son. She died in her hometown.

https://ancestors.familysearch.org/en/G3MW-H82/queen-of-formaeil-o%27cathain-1175

https://en.m.wikipedia.org/wiki/Ó_Catháin

Other Events and Attributes:

• Appointments / Titles: King of Formaeil
• FSID: M8KR-8KR

Notes:

Clan of The Ó Catháin - a sept of the Cenél nEógain branch of the Northern Uí Néill