The High Kings of Ireland
- Sources yet to be consulted:
Brian Boru, High King of Ireland
King of Munster 978-1014,
High King of Ireland 1002-1014
(though some regional rulers did not accept his authority),
led the Irish of Munster
to victory against the Irish of Leinster and the
Norse Vikings of Dublin
Battle of Clontarf
, Co.Dublin, in 1014,
but he was famously killed himself by fleeing Norsemen,
Teige O'Brien, King of Munster.
mar Gormlaith ingen Murchada
and had issue:
Donnchad O'Brien, King of Munster
had his half-brother Teige
killed in 1023,
mar Diarmait mac Maíl,
King of Leinster and Ireland
Tradition says Brian Boru was buried in 1014 at
(which has been re-built many times since).
Photo from here
Descent of English Royal family from Irish Royal family
English and British monarchs since Henry II
Henry II invaded Ireland in 1169.
It took just over 200 years for the English royal family to be descended from the Irish kings.
Every English and British monarch from Henry IV
on (succ 1399)
descends from Brian Boru.
Extract of "Coins of English monarchs" poster.
You can order it
It incorrectly labels Richard I the Lionheart
as "Richard II".
Descent of Irish people from English Royal family
Queen's visit to Ireland in May 2011
was such a success,
and filled with such unexpected warmth,
that I thought I would point out how Irish she in fact is.
The Irish Times published
my letter on 21 May 2011.
THE QUEEN'S IRISH ANCESTORS
While we are all re-evaluating the Queen as someone who might actually like Ireland, it might be timely to summarise her extensive Irish ancestry.
The two great Norman families of medieval Ireland were the Butlers and the Fitzgeralds. The Queen directly descends from both many times. The most recent descents I can see for her are from James Butler, 1st Duke of Ormonde (died 1688), from James Fitzgerald, 10th Earl of Desmond (died 1529) and from Gerald Fitzgerald, 11th Earl of Kildare (died 1585). Through the latter she descends from Irish heroes Garret Mor Fitzgerald, 8th Earl of Kildare, and Garret Og Fitzgerald, 9th Earl of Kildare. Her ancestor Baron Portlester lies in a spectacular tomb 
in St.Audoen's church on High Street in Dublin.
In terms of Gaelic families, the Queen descends (remarkably) from the rebel Hugh O'Neill, Earl of Tyrone (died 1616) and also from Diarmaid O'Brien, 5th Baron of Inchiquin (died 1624). Through the latter she descends from Connor O'Brien, King of Thomond (died 1540) and Domnall Mor O'Brien, King of Thomond (died 1194). Ultimately, she descends from Aoife Mac Murrough (who married Strongbow in 1170) and from Brian Boru, High King of Ireland (died 1014).
In fact, Ireland is littered with her ancestral homes and her ancestors' tombs. Her most recent Irish-born ancestor was apparently Richard Wellesley, 1st Marquess Wellesley (died 1842). Given all this, it does seem unfair that she was never allowed visit her ancestral homeland until now.
Actually I got this slightly wrong.
The Baron Portlester
is not buried in St.Audoen's.
There is a spectacular effigy of him there, but he is actually buried elsewhere.