Charles O'Brien, 5th Viscount Clare
Charles O'Brien, 5th Viscount Clare (1673–1706) was the son of Daniel O'Brien, 3rd Viscount Clare and Philadelphia Lennard.
He married Charlotte Bulkeley, daughter of Henry Bulkeley and Sophia Stuart, on 9 January 1696, at Saint-Germain-en-Laye, France.
Henry Bulkeley was the "Master of the Household" for Kings Charles II and James II.
The family fought as part of the Jacobite Irish Army during the War of the Two Kings, before going into exile in the Flight of the Wild Geese.
Charles succeeded his brother Daniel O'Brien, 4th Viscount Clare, to the title as 5th Viscount Clare in the Jacobite Peerage on his brother's death from a mortal wound received in the Battle of Marsaglia, Italy 4 October 1693.
Charles was transferred from the Queen's Dismounted Dragoons where he was colonel, to the command of O'Brien's Regiment on 6 April 1696.
Later in the year he led the regiment in the siege of Valenza in Lombardy, and the next year they were stationed with the army at Meuse.
By 1698 over one third of King James’ army was either dead or crippled, and when the treaty of Ryswick ended the war between Louis and William, James’ soldiers were disbanded, unemployed, and homeless.
Many became beggars but others joined the Irish Brigade in the Spanish army, while others went to Austria and entered the Catholic Corps.
Hostilities were renewed and Clare’s Regiment was assigned to the Army of Germany for two years in 1701-02.
At the Battle of Cremona, in 1702, the Irishmen defended the town against Prince Eugene and the imperial army.
The attack was to be a surprise but the Wild Geese foiled the attempt.
The following year Lord Clare was promoted to brevet Brigadier of Infantry on 2 April 1703.
A few months later on 20 September 1703, the unit took part in the successful Battle of Hochstedt, better known as the Battle of Blenheim and a year later was involved with the unsuccessful battle on 13 August 1704, at the second Battle of Blenheim.
Although Clare’s Regiment experienced ups and downs, they were always admired.
Two months after Blenheim, Charles rose to the brevet rank of Marshal-de-Camp on 26 October 1704, and a year later Lord Clare was assigned to the Army of the Moselle under the Marshel de Villars.
Clare’s Regiment fought in the disastrous Battle of Ramillies on 23 May 1706, where they distinguished themselves with great glory, but Lord Clare was mortally wounded and died at Brussels, Belgium.
Due to the great service the O'Brien family had given to France, and having risked all, King Louis XIV made sure that the regiment was kept in the family, and appointed Lt. Col. Murrough O'Brien (of the Carrigonnell O'Brien's) as its commander until the minor Charles came of age.
Charles O'Brien and Charlotte Bulkeley had two children, Charles O'Brien, 6th Viscount Clare (27 Mar 1699 – 9 Sep 1761) and Henry O'Brien (b. 12 Feb 1701).
Kaoru Hatoyama
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Daniel O'Brien, 4th Viscount Clare
Daniel O'Brien, 4th Viscount Clare( died 1693) was the son of Daniel O'Brien, 3rd Viscount Clare and Philadelphia Lennard.
A Jacobite supporter of James II, he served with the Irish Army during the War of the Two Kings.
He was commander of a regiment which he conveyed to France where he fought in the Battle of Marsaglia on 4 October 1693 and was mortally wounded.
Daniel O'Brien never married and was therefore succeeded by his brother Charles O'Brien, 5th Viscount Clare.
Connor O'Brien, 2nd Viscount Clare
Connor O'Brien, 2nd Viscount Clare( 1605 – 1670) was the son of Daniel O'Brien, 1st Viscount Clare and Lady Catherine FitzGerald, a daughter of Gerald, 14th Earl of Desmond.
He married Honora O' Brien, daughter of Daniel O'Brien and Ellen FitzGerald, a daughter of the Knight of Glin, and together they had one son Daniel O'Brien, 3rd Viscount Clare, and a daughter Honora, who married John FitzGerald, 13th Knight of Kerry.
O'Brien succeeded to the title Baron Moyarta in 1666.
Daniel O'Brien, 3rd Viscount Clare
Daniel O'Brien, 3rd Viscount Clare was an Irish nobleman, the son of Connor O'Brien, 2nd Viscount Clare and Honora O'Brien.
Clare was appointed commander of a newly raised regiment of foot, Clare's Regiment of Foot, an Irish regiment in the Dutch States Army, on 8 August 1674.
He was replaced within twelve months by Sir John Fenwick.
From July 1751 this regiment was known as the 5th Regiment of Foot.
During the War of the Two Kings, Clare served with the Jacobite Irish Army loyal to James II.
He was the commander of Clare's Dragoons regiment which he led against William of Orange at the Battle of the Boyne and later exile in France as part of the Flight of the Wild Geese.
He married Philadelphia Lennard, sister of the Earl of Sussex, and together they had three children:
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Charles O'Brien, 6th Viscount Clare
Charles O'Brien, (17 March 16999 September 1761), 6th Viscount Clare (titular 9th Earl of Thomond) was an Irish military officer in French service, known to posterity as the Maréchal de Thomond.
Charles O'Brien was the son of Charles O'Brien, 5th Viscount Clare and Charlotte Bulkeley, the sister of Anne, second wife of James FitzJames, 1st Duke of Berwick and Marshal of France.
He fought for France against Spain in 1718 with the rank of colonel in the service of his father's regiment and later fought in the War of the Polish Succession in the Siege of Philippsburg in June 1734, where he was wounded.
He gained the rank of Maréchal de Camp in 1735 in the service of the King's Armies.
O'Brien also fought in the Battle of Dettingen in 1743 and in the Battle of Fontenoy in 1745.
O'Brien was invested as a Knight, L'Ordre du Saint-Esprit of France on 2 February 1746 at the chapel of Versailles, Île-de-France, France.
He held the office of Governor of Neuf-Brisach in Alsace, and was Commander-in-Chief of the province of Languedoc.
In 1757 he was made a Marshal of France.
He died on 9 September 1761, aged 62, at Montpellier, France.
O'Brien married Marie Genevieve Louise Gautier, daughter of François Gautier, marquis de Chiffreville, in 1755 and had three children:

Question: Who is Charles O'Brien, 5Th Viscount Clare's paternal grandmother?
Answer: Honora O'Brien