Erenfried I
Erenfried I of Maasgau is the count of Bliesgau,,, and the count of Charmois( fl. 866–904).
He married Adelgunde of Burgundy( 860–902), a daughter of Conrad II, Duke of Transjurane Burgundy, Count of Auxerre, and Judith de Frioul.
They left issue:
Charles II, Duke of Bourbon
Charles II, Duke of Bourbon( Château de Moulins, 1434 – September 13, 1488, Lyon), was Archbishop of Lyon from an early age and a French diplomat under the rule of Louis XI of France.
He had a 2- week tenure as Duke of Bourbon in 1488, being ousted afterward by his younger brother and successor, Peter II, Duke of Bourbon.
Adelaide of Auxerre (born c. 870)
Adelaide of Auxerre( born between 865- 870) was a Duchess consort of Burgundy in the Middle Ages.
She was the daughter of Conrad II, Duke of Transjurane Burgundy and his wife Waldrada of Worms.
In 888, she married Richard, Duke of Burgundy.
They had probably three or five children:
Conrad II, Duke of Merania
Conrad II( died 8 October 1182) was the Duke of Merania( or Dalmatia) from 1159 until his death.
He became Count of Dachau( as Conrad III) in 1172.
Conrad was the only child of Conrad I, Duke of Merania, and Matilda of Falkenstein.
He was only a child when his father died and he inherited Merania.
When he came of age, he received Dachau from his uncle Arnold.
Contemporary documents call him" dux de Dachawe" or" Dachau".
Conrad II was the last Wittelsbach duke as he died without heirs and was buried in Scheyern beside his father, grandfather, and great- grandfather.
Merania passed then to the House of Andechs.
Maria of Brabant, Duchess of Bavaria
Maria of Brabant( 1226–1256) was a daughter of Henry II, Duke of Brabant, and Maria of Swabia.
She married Louis II, Duke of Bavaria, being the first of three wives.
Waldrada of Worms
Waldrada of Worms( or Waldraith; born 801, date of death unknown).
She was first married to Robert III of Worms, in 819 in Wormsgau, Germany.
This marriage brought in 830 a son, Robert IV the Strong.
The marriage ended when Robert III died in 834.
She was the second wife of Conrad II, Duke of Transjurane Burgundy.
They had two known children, Adelaide of Auxerre and Rudolph I of Burgundy.
Her father was Adrian, Count of Orléans( 758- 824), and mother was also named Waldrada, daughter of William of Gellone( William of Orange) 755-812.
Conrad II, Duke of Transjurane Burgundy
Conrad II
the Younger was the Count of Auxerre from 864 until his death in 876.
He was a son of Conrad I of Auxerre, and Adelaide of Tours; an older brother of Hugh the Abbot; and a member of the Bavarian branch of the Welfs.
In 858, at the coaxing of Charles the Bald, his cousin, he and his brother betrayed Louis the German when he sent them on an espionage mission and went over to Charles, who rewarded them handsomely because he had lost his Bavarian "honores".
He acted as Duke of Transjurane (Upper) Burgundy from then until about 864.
He married Judith, daughter of Eberhard of Friuli, and later Waldrada of Worms, by whom he left a son, Rudolf, who later became King of Transjurane Burgundy, and a daughter, Adelaide of Auxerre, who married Richard, Duke of Burgundy, and had issue.
Adelaide of Tours
Adelaide (Aelis) of Tours (c.820-c.866) was a daughter of Hugh of Tours and his wife Ava.
She married Conrad I, Count of Auxerre, with whom she had at least two children, Hugh and Conrad the Younger.
Additionally legend of the later Swabian branch of the House of Welf assigns to Conrad and Adelaide an additional son, Welf I, a relationship considered probable.
After her husband's death around 864, she married Robert the Strong, and had two children, Odo and Robert I of France.
Robert's grandson was Hugh Capet, the first King of the House of Capet.
Princess Augusta of Saxe-Meiningen
Princess Augusta Louise Adelaide Caroline Ida of Saxe-Meiningen (6 August 1843 – 11 November 1919) was the daughter of Bernhard II, Duke of Saxe-Meiningen and his wife Princess Marie Frederica of Hesse-Kassel.
She was the mother of Ernst II, Duke of Saxe-Altenburg.
Frederick II, Duke of Upper Lorraine
Frederick II( c. 995–1026), son of Thierry I of the House of Ardennes and Richilde von Blieskastel, daughter of Folmar III, Count in Bliesgau; was the count of Bar and duke of Lorraine, co-reigning with his father from 1019.
On the Emperor Henry II's death in 1024, he joined Ernest II, Duke of Swabia, in revolt against the new king, Conrad II.
Soon they made peace and recognised the new king.
Frederick died soon after.
He married Matilda of Swabia, daughter of Herman II, Duke of Swabia, and sister- in- law of Conrad.
They had three children:

Question: Who is Conrad Ii, Duke Of Transjurane Burgundy's maternal grandfather?
Answer: Hugh of Tours