Christopher H. Clark
Christopher Henderson Clark (1767 – November 21, 1828) was a congressman and lawyer from Virginia.
He was the brother of James Clark, the uncle of John Bullock Clark, Sr. and the great-uncle of John Bullock Clark, Jr..
Mary of Lusignan, Countess of Brienne
Mary of Lusignan (French: Marie de Lusignan; before March 1215 – 5 July 1251 or 1253), was the wife of Count Walter IV of Brienne and Countess of Brienne from the time of her marriage in 1233 to her husband's death while on Crusade in 1244.
Mary's parents were King Hugh I of Cyprus and Alice of Champagne, making her a maternal granddaughter of Queen Isabella I of Jerusalem.
Her two surviving sons were John, Count of Brienne, and Hugh of Brienne.
John Montgomery Glover
John Montgomery Glover( September 4, 1822 – November 15, 1891) was a North American politician, who served as a U.S. Representative from Missouri, he was the uncle of John Milton Glover.
Giacomo Bosio
Giacomo Bosio( 1544–1627) was a brother of the Order of St. John of Jerusalem and the historian of this order.
He was the uncle of the Maltese antiquary Antonio Bosio.
Erard I, Count of Brienne
Erard I, Count of Brienne( 1060 – 1114) was Count of Brienne at the end of the 11th century.
He was the son of Gautier I of Brienne, count of Brienne, and his wife Eustachie of Tonnerre.
In 1097 he fought in the First Crusade.
In 1110 he married Alix of Roucy- Ramerupt, daughter of André de Montdidier- Roucy, seigneur de Ramerupt.
They had 3 children:
John of Brienne
John of Brienne (1170 – 27 March 1237), also known as John I, was King of Jerusalem from 1210 to 1225 and Latin Emperor of Constantinople from 1229 to 1237.
He was the youngest son of Erard II of Brienne, a wealthy nobleman in Champagne.
John, originally destined for an ecclesiastical career, became a knight and owned small estates in Champagne around 1200.
After the death of his brother, Walter III, he ruled the County of Brienne on behalf of his minor nephew Walter IV (who lived in southern Italy).
The barons of the Kingdom of Jerusalem proposed that John marry their queen, Maria.
With the consent of Philip II of France and Pope Innocent III, he left France for the Holy Land and married the queen; the couple were crowned in 1210.
After Maria's death in 1212 John administered the kingdom as regent for their infant daughter, Isabella II; an influential lord, John of Ibelin, attempted to depose him.
John was a leader of the Fifth Crusade.
Although his claim of supreme command of the crusader army was never unanimously acknowledged, his right to rule Damietta (in Egypt) was confirmed shortly after the town fell to the crusaders in 1219.
He claimed the Armenian Kingdom of Cilicia on behalf of his second wife, Stephanie, in 1220.
After Stephanie and their infant son died that year, John returned to Egypt.
The Fifth Crusade ended in failure (including the recovery of Damietta by the Egyptians) in 1221.
John was the first king of Jerusalem to visit Europe (Italy, France, England, León, Castile and Germany) to seek assistance for the Holy Land.
He gave his daughter in marriage to Holy Roman Emperor Frederick II in 1225, and Frederick ended John's rule of the Kingdom of Jerusalem.
Although the popes tried to persuade Frederick to restore the kingdom to John, the Jerusalemite barons regarded Frederick as their lawful ruler.
John administered papal domains in Tuscany, became the "podestà" of Perugia and was a commander of Pope Gregory IX's army during Gregory's war against Frederick in 1228 and 1229.
He was elected emperor in 1229 as the senior co-ruler (with Baldwin II) of the Latin Empire, and was crowned in Constantinople in 1231.
John III Vatatzes, Emperor of Nicaea, and Ivan Asen II of Bulgaria occupied the last Latin territories in Thrace and Asia Minor, besieging Constantinople in early 1235.
John directed the defence of his capital during the months-long siege, with the besiegers withdrawing only after Geoffrey II of Achaea and united fleets from Italian towns defeated their fleet in 1236.
The following year, John died as a Franciscan friar.
John II of Brienne, Count of Eu
John II of Brienne( died 11 July 1302 in Kortrijk) was the son of John I of Brienne, Count of Eu and Beatrice of Saint- Pol.
He succeeded his father as Count of Eu in 1294.
He married Jeanne, Countess of Guînes( d. 1331/ 32), the daughter and heir of Baldwin IV, Count of Guînes.
They had two children: John was killed at the Battle of the Golden Spurs.
John II of Brienne
Sir John of Brienne( died c. 1296), was a French nobleman who served as Grand Butler of France in 1258.
Erard II, Count of Brienne
Erard II of Brienne (died 1191) was count of Brienne from 1161 to 1191, and a French general during the Third Crusade, most notably at the Siege of Acre.
He was the son of Gautier II, count of Brienne, and Adèle of Baudemont, daughter of Andrew, lord of Baudemont and Agnes of Braine.
His paternal grandparents were Erard I, Count of Brienne and Alix de Roucy.
During this siege he saw his brother André of Brienne die on 4 October 1189, before being killed himself on 8 February 1191.
Erard II's nephew was Erard of Brienne-Ramerupt.
Before 1166 he married Agnès of Montfaucon
(† after 1186), daughter of Amadeus II of Montfaucon and of Béatrice of Grandson-Joinville.
Their children were:
Hugh, Count of Brienne
Hugh, Count of Brienne and Lecce( – 9 August 1296) was the second surviving son of Count Walter IV of Brienne and Marie de Lusignan of Cyprus.

Question: Who is the uncle of John Of Brienne?
Answer: André of Brienne