Guillemette of Neufchâtel
Guillemette de Neufchâtel (1260–1317) was a French noblewoman, the daughter of Amadeus, Count of Neufchâtel and his wife, Jordanna of Arberg.
In 1259, her great-aunt Margaret, married Richard of Neufchâtel-en-Bourgogne.
As her dowry, she brought the Lordships of Blamont, Châtelot, Belmont, and Cuisance into the marriage.
The Lords of Neufchâtel-en-Bourgogne placed Blamont under the protection of the Duke of Burgundy and thus detached it from Montbéliard.
In 1282, Guillemette married Reginald of Burgundy.
They had five children:
In 1283, her great-grandfather, Theodoric III, Count of Montbéliard (1205–1283) died.
He had outlived all his children and in his will, he left the County of Montbéliard to his great-granddaughter Guillemette.
Theobald III of Neufchâtel, who was a grandchild of Theodoric III and who wanted Montbéliard for himself, conspired with Reginald's brother Otto IV to have Montbéliard recognized as a fief of Burgundy.
To resolve this, Reginald ceded Blamont and Châtelot to Theobald.
Othenin, Count of Montbéliard
Othenin (died 1338), called the Mad, was a Count of Montbéliard.
He was the only son of Reginald of Burgundy and his wife, Guillemette of Neufchâtel.
Othenin could not intervene in the affairs of the county because of his mental problems.
He was placed under the tutelage of his uncle, Hugh of Chalon.
He lived in the reclusive Château de Montfaucon ("Castle of Montfaucon"), near Besançon, until his death.
Othenin died in 1338.
He was buried in the church of Saint-Maimbœuf Montbéliard.
Henry I of Mountfacon was named his successor by the Holy Roman Emperor Louis IV.
Theodoric II, Count of Montbéliard
Theodoric II( ca. 1080 – January 1163) was Count of Montbéliard( 1105 – 1163).
He was the son of Theodoric I, Count of Montbéliard, Bar and Verdun, and Ermentrude of Burgundy.
He received first possessions of the family, but they were chased by his subjects because of his bad temper.
After the death of his father in 1105, he received the county of Montbéliard, becoming its count that same year.
He played an important role with emperors, participating in the Concordat of Worms.
He had also founded several monasteries.
His wife is unknown.
He had the following issue:
Henry, Count of Württemberg
Henry of Württemberg (7 September 1448 – 15 April 1519) was, from 1473 to 1482, count of Montbéliard.
Amadeus, Count of Neuchâtel
Amadeus, Count of Neufchâtel( died 1285) was a son of Count Rudolph III and his wife, Sybille of Montbéliard.
In 1272, he succeeded his father as Count of Neuchâtel.
However, his brothers questioned the legitimacy of his sole rule and demanded a share of his inheritance.
They asked the grandfather Theodoric III, Count of Montbéliard to arbitrate the dispute.
Theodoric deviated from the usual practice in those days, and decided that the county should be regarded as an indivisible entity.
He awarded the county to Amadeus, but acknowledged that his brothers were entitled to a share.
However, the brothers would have to swear allegiance to Amadeus.
Amadeus II of Montfaucon
Amadeus II of Montfaucon( 1130 – 1195) was Count of Montbéliard and Lord of Montfaucon from 1163 until his death.
He was the son of Richard II of Montfaucon and Sophie of Montbéliard.
Married to Beatrice Grandson- Joinville, then Osilie of Faucogney, he had the following issue:
Henriette, Countess of Montbéliard
Henriette( 1387 – 14 February 1444) was Sovereign Countess of Montbéliard from 1397 until 1444.
She was the daughter of Henry of Orbe( died 1396), and the heiress of her grandfather, Stephen, Count of Montbéliard.
Her great- grandfather was Henry I of Montbéliard.
She married Eberhard IV, Count of Württemberg and governed the city of Montbéliard together with her husband.
It was because of this marriage that Montbéliard became a part of Württemberg.
At his death in 1419, she took over the regency for her son Ulrich.
In 1420 her daughter Anna( 1408 – 1471, Countess of Katzenelnbogen), married Count Philipp of Katzenelnbogen in Stuttgart, one of the most magnificent medieval weddings, with a dowry of.
Reginald of Burgundy
Reginald of Burgundy( died 1321) was Count of Montbéliard," jure uxoris", from 1282 to 1321.
He was a son of Hugh of Chalon( from the House of Ivrée), sire of Salins, and his wife Adelaide.
He married Guillemette of Neufchâtel and they had a son, Othenin, Count of Montbéliard and a daughter, Joanna, who married first Ulrich III, Count of Pfirt and second Rudolf Hesso, Margrave of Baden- Baden.
By her first marriage she had four daughters, of whom two survived- Joanna of Pfirt, wife of Albert II, Duke of Austria and Ursula.
After Reginald's death in 1322, his daughter Joanna inherited his lands.
After Ulrich's death in 1324, she remarried and had two more daughters, Margaret and Adelaide.
Joanna of Burgundy
Joanna of Burgundy( died 1349) was a daughter of Reginald of Burgundy and his wife, Guillemette of Neufchâtel.
She married three times:
When her brother Othenin, Count of Montbéliard died childless in 1339, she and her second husband Rudolf Hesso inherited the Lordships of Belfort and Héricourt.
After the death of her third husband, she divided her possessions amongst her four daughters.
Margaret received Héricourt; Adelaide and Ursula shared Belfort.
Sophie, Countess of Bar
Sophie of Bar( c. 1004 or 1018 – January 21 or June 21, 1093) was sovereign Count of Bar and lady of Mousson between 1033 and 1093.
She succeeded her brother, Frederick III, Duke of Upper Lorraine, ruled in co-regency with her spouse Louis, Count of Montbéliard, and was succeeded by her son Frederick of Montbéliard.

Question: Who is Othenin, Count Of Montbéliard's maternal grandfather?