Nicolas 'le Beau' d'Oisy, seigneur d'Avesnes, de Leuze & de Condé

https://www.familysearch.org/tree/person/details/LDMJ-MP2

Medlands

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"Nicholas d 'Oisy, Lord of Avesnes, nicknamed le Beau ("the Beautiful") (c. 1130 – c. 1170), was a son of Walter I, Lord of Avesnes and his wife, Ada of Tournai. He was Lord of Avesnes, Leuze and Condé. He built castles in Landrechies and Condé.
Nicholas was married to Matilda de la Roche, the widow of Thierry de Walcourt. She was the daughter of Henry I of la Roche (c. 1100 – 1126), Count of la Roche and warden of Stavelot and Malmedy and his wife, Matilda of Limburg. Her paternal grandfather was Albert III, Count of Namur; her maternal grandfather was Henry, Duke of Lower Lorraine.
They had the following children:
James of Avesnes, succeeded his father and died during the Third Crusade
Ida (d. c. 1205), married Ingelram, Count of Saint Pol and secondly, castellan William IV of Saint-Omer
Fastrad, warden of La Flamengerie Abbey. He had three children, of whom James became bishop of Tournai
a daughter
possibly Radulf"
[https://en.wikipedia.org/wiki/Nicholas_d%27Oisy,_Lord_of_Avesnes]
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"The House of Avesnes was a noble medieval family from Hainaut . The name refers to one of the towns called Avesnes , which are now located in northern France. In Dutch this house is known as Avennes . Avesnes-sur-Helpe was founded in the 11th century by Edward the Bearded . A distant descendant of his, Jacob of Avesnes (lord of Avesnes from 1171 - 1191 ), had several children, causing the family to split into two branches.
Branch Saint-Pol
The Saint-Pol branch was created by the marriage of Mary of Avesnes , daughter of Wouter II of Avesnes , eldest son of Jacob, and Margaret of Blois , with Hugh V of Saint-Pol . With Mary, the original Avesnes dynasty died out in the male line and the seigneury of Avesnes was added to the possessions of the Saint-Pol-sur-Ternoise and Blois families , both of the House of Châtillon .
Dutch branch (1182-1345)
This branch started with Burchard of Avesnes (born 1182 ). He was the third son of Jacob of Avesnes . This branch existed longer than the main branch, namely until 1345 . The thirty-year-old Burchard married the 10-year-old Margaret II of Flanders in 1212 . Through this marriage he brought his family into higher political circles and Burchard can therefore be seen as the founder of the house. However, due to the difficult history of the house, the history of this house was not without problems. Margaretha married William II of Dampierre in 1223, after the marriage with Burchard was declared invalid . Because both marriages produced children who wanted a share in the inheritance (and power), a point of contention had arisen. These two branches of Margaretha's descendants fought for inheritance in the following decades, in particular the power struggle for the land of debates . Ultimately, Hainaut would go to the Avesnes and Flanders to the Dampierres.
The son of Margaretha and Burchard was called John of Avesnes (1218-1257). He strategically married Aleid van Holland , a sister of William II of Holland, in 1246 . Their eldest son John I of Avesnes (1247-1304) would eventually become Count of Holland , Zeeland and Hainaut . Their other son Guy of Avesnes (1253-1317) became bishop of Utrecht .
The last descendant of this family is William IV of Holland (1317-1345). He died childless and his inheritance went to his sister Margaret of Bavaria (1310-1356), leaving it in Bavarian hands.
Family tree
The lords of Avesnes
Fastraad I of Oisy (died before 1092), guardian of Tournai , married Ada, probably a daughter of lord Wederik of Avesnes
Gozewijn (died 1126), lord of Avesnes, Condé and Leuze
Gozewijn (died 1127), lord of Avesnes, Condé and Leuze
Fastraad II of Oisy (died after 1111), guardian of Tournai
Wouter I (died 1147), lord of Avesnes, Condé and Leuze
Diederik, married Richildis of Hainaut, daughter of Count Baldwin III of Hainaut
Nicholas (died 1169/1171), lord of Avesnes, Condé and Leuze, married Mahaut of Laroche, daughter of Count Henry I of Namur"
[https://nl.wikipedia.org/wiki/Huis_Avesnes#De_heren_van_Avesnes]