He was instrumental in his son, Hugh's marriage to Bertha of Aumale, which expanded the family's territory.
[1] In 1026–7, Enguerrand, using the title of count, endorsed a charter in the presence of King Robert II.
[2] By the 1030s, Enguerrand had become a key figure among his influential neighbors, whose backing Duke Robert of Normandy was keen to gain before embarking on his pilgrimage to the Holy Land.
[3] It is likely that Enguerrand also orchestrated Hugh's marriage to Bertha, the daughter of Guerinfridus, the castellan of Aumale, located on the upper River Bresle between Normandy and the Beauvaisis, thereby expanding the family's territorial holdings further south.
Enguerrand married Adelaide, widow of Baudouin de Boulogne, daughter of Arnulf, Count of Holland, they had: