John, Count of Brienne
John, Count of Brienne (c. 1235 – c. 1260) was the eldest son of Walter IV of Brienne and Marie of Lusignan, a princess of Cyprus.
He inherited the County of Brienne on his father's death in 1246, but preferred to live among his mother's relatives at the court of Cyprus, and played little part in international politics.
In 1255, he married Marie, Lady of Thieusies (in Hainaut), the daughter of Sohier II of Enghien.
They had no children, and when he died, he was succeeded by his brother Hugh.
Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.
She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
Arnold V, Count of Loon
Arnold V de Looz,( died August 22, 1327) was Count of Loon from 1279 to 1323 and Count of Chiny( Arnulf III) from 1299 to 1310.
He was the son of John I, Count of Looz and Mathilde Jülich.
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:
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.
Walter IV, Count of Brienne
Walter IV the Great of Brienne ((1205–1244) was Count of Brienne 1205–1244.
He was the son of Walter III of Brienne and Elvira of Sicily.
Around the time of his birth, his father lost his bid for the Sicilian throne and died in prison.
His inheritance of the Principality of Taranto and the County of Lecce was confiscated.
While a teenager, Walter was sent to Outremer where his uncle John of Brienne was the ruler of Jerusalem.
In 1221 John gave him the County of Jaffa and Ascalon, and arranged a marriage with Marie de Lusignan (before March, 1215 – ca. 1252 or 1254), daughter of Hugh I of Cyprus, in 1233.
Even after his uncle had been forced out of the Kingdom by Frederick II, Walter remained one of the most important lords of the Kingdom of Jerusalem.
He was commander of the Crusader army that marched against the forces of As-Salih Ayyub in 1244.
Against the advice of al-Mansur of Homs, his Syrian ally, Walter insisted on taking the offensive, rather than fortifying his camp and awaiting the retreat of the Khwarezmians.
In the disastrous Battle of La Forbie, the Crusader-Syrian forces were nearly annihilated.
Walter was captured, tortured before the walls of Jaffa, and ultimately turned over to the Egyptians after the Khwarezmian defeat before Homs in 1246.
He was imprisoned in Cairo and murdered by merchants whose caravans he had robbed, with the sultan's consent.
He was succeeded by his elder son John, who died childless.
His younger son Hugh of Brienne settled in Southern Italy and became a partisan of Charles of Anjou, who returned to him the family's county of Lecce.
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.
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.

Question: Who is John, Count Of Brienne's paternal grandmother?
Answer: Elvira of Sicily