Yolanda of Vianden
Mother Yolanda( or Yolande, Iolanda) of Vianden, O.P.,( 1231–1283) was the youngest daughter of Count Henry I of Vianden and Margaret, Marchioness of Namur.
She joined the Dominican monastery in Marienthal, Luxembourg, against the wishes of her parents when she was very young.
She later became its devout prioress and is now a legend in the history of that nation.
James Drummond (chaplain)
James Drummond was a seventeenth century Scottish covenanting field preacher.
He was imprisoned on Bass Rock for around nine months.
At the time of his incarceration his occupation was listed as chaplain to Margaret, Marchioness of Argyll.
John III, Marquis of Namur
John III( died 10 March 1429) was between 1418 and 1429 the last independent Marquis of Namur.
He was the youngest son of William I, Marquis of Namur and Catherine of Savoy( † 1388), daughter of Louis II of Savoy, baron of Vaud, and Isabella of Châlon.< br>
When his father died in 1391, he inherited Wijnendale and Ronse.
He succeeded his elder brother William II as Marquis of Namur, when William died without children in 1418.
John never married, but had an illegitimate son with his cousin Cécile of Savoy: Philip of Namur, seigneur de Dhuy( died 1449).
John III lead a very luxurious life, and he had to raise taxes to finance his expenses.
This led to revolts and high debts, which forced John to sell his County to Philip the Good, Duke of Burgundy( 23 April 1421) for 30.000 golden crowns and the clause that he could benefit from the usufruct of his former county.
Philip the Good incorporated Namur into the Burgundian Netherlands, thus ending the existence of an independent County of Namur.
John I, Marquis of Namur
John I of Namur( 1267 – 31 January 1330) was the ruler of Namur from 1305 to 1330.
He was a member of the House of Dampierre, the son of Guy of Dampierre, Count of Flanders and Marquis of Namur, and his second wife Isabelle of Luxembourg.
John was the father of Blanche of Namur, Queen of Sweden and Norway.
He was the elder brother of Guy of Namur, whom he sent to command the Flemish rebels against the French Kingdom in the 1302 Battle of the Golden Spurs.
Yolanda of Flanders
Yolanda of Flanders, Marchioness of Namur (1175 – August 1219) was Empress of the Latin Empire in Constantinople in her own right from 1216 to 1219 and from 1217 as a sole ruler, after her spouse Peter II of Courtenay was captured and imprisoned before he could reach Constantinople.
She was ruling Marchioness of Namur from 1212 until 1219.
Guy II, Marquis of Namur
Guy II of Namur,( 1312 – 12 March 1336), was Count of Namur from 1335 to 1336.
He was the second son of John I, Marquis of Namur, and Mary of Artois.
He participated in 1332 on the side of the Count of Flandres against the Duke of Brabant, in the war over Mechelen.
He succeeded his brother John II as Count of Namur on 2 April 1335.
Under influence of his younger brother Robert of Namur, he recognized King Edward III of England as his Lord, in exchange for a pension.
He also participated in the War against Scotland with 300 men, but was surprised by a larger Scottish force under John Randolph, 3rd Earl of Moray in the Battle of Boroughmuir.
Guy was taken prisoner, but released for ransom.
After his return to Namur, he participated in a tournament in Flanders, where he was mortally wounded.
He was succeeded by his younger brother Philip.
Albert II, Count of Namur
Albert II of Namur was Count of Namur from the death of his elder brother Robert in 1016 to Albert's death in 1067.
They were the sons of Albert I, and Ermengarde daughter of Charles, Duke of Lower Lorraine.
William I, Marquis of Namur
William I, Marquis of Namur," the Rich",( 1324 – 1 October 1391) was Count of Namur from 1337 until his death.
Margaret, Marchioness of Namur
Margaret, Marchioness of Namur (c. 1194 – 17 July 1270) was ruling Marchioness of Namur in 1229-1237.
She was the daughter of Peter II of Courtenay and Yolanda of Flanders.
Robert II, Count of Namur
Robert II of Namur was Count of Namur from the death of his father in 1010 to some time between 1018 and 1031.
He was the son of Albert I, and Ermengarde daughter of Charles, Duke of Lower Lorraine.

Question: Where did Margaret, Marchioness Of Namur's mother die?
Answer: Constantinople