Earl of Desmond - Ancestry of The Desmond Geraldines

Ancestry of The Desmond Geraldines

Thomas FitzMaurice FitzGerald, Lord of O'Connelloe, was the progenitor of the Geraldine House of Desmond, and thus the patrilineal ancestor of the Barons Desmond, and of the earls of Desmond of the first creation.

Thomas FitzMaurice FitzGerald was the son of Maurice FitzGerald, Lord of Lanstephan, founder of the Irish Geraldines. Through Maurice's mother Nest ferch Rhys ap Tewdwr, the House of Desmond traced descent in the female line from the House of Dinefwr.

Thomas's mother was Alice de Montgomery, granddaughter of High King Muircheartach Ua Briain, a grandson of High King Brian Boru of the Dál gCais. Through Muicheartach's mother, Mór of the Cenél Fiachach, the House of Desmond traced descent to Niall of the Nine Hostages, progenitor of the Uí Néill.

Over a century after Thomas's death, Gerald FitzGerald, 3rd Earl of Desmond, married Eleanor Butler. Through her, John FitzGerald, 4th Earl of Desmond and all subsequent Geraldine earls of Desmond could trace descent through Eleanor de Bohun to Elizabeth of Rhuddlan, daughter of King Edward I of England of the House of Plantagenet by his queen, Eleanor of Castile of the House of Burgundy.

Ancestors of Earl of Desmond
Otho
Walter FitzOtho, tenant-in-chief of lands in Berkshire, Buckinghamshire, Hampshire, and Middlesex
Gerald de Windsor, Constable of Pembroke Castle
Beatrice
Maurice FitzGerald, Lord of Lanstephan
Tewdwr ap Cadell ap Einion ap Owain ap Hywel Dda
Rhys ap Tewdwr, Prince of Deheubarth, of the House of Dinefwr
Nest ferch Rhys, Princess of Deheubarth
Rhiwallon ap Cynfyn ap Gwerstan ap Gwaithfoed
Gwladys ferch Rhiwallon of Powys
Nest verch Cadell
Thomas FitzMaurice FitzGerald, Lord of O'Connelloe
Roger de Montgomerie
Roger de Montgomerie, 1st Earl of Shrewsbury
Josceline
Arnulf de Montgomery
William I Talvas, seigneur of Alençon
Mabel de Bellême
Hildeburg
Alice de Montgomery
Toirdhealbhach Ua Briain, King of Munster, High King of Ireland, son of Tadg mac Briain, grandson of Brian Boru, High King of Ireland
Muircheartach Ua Briain, King of Munster, High King of Ireland
Mór, daughter of Gilla Brigte Ua Maíl Muaid of Cenél Fiachach
Lavacroth
Dubchoblaig

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