[1][c] Conon first appears in 1055 alongside his father and his brother Rudolf confirming the diploma by which the Emperor Henry III transferred the church of Longlier [fr] to the abbey of Florennes.
[2] Conon was among the barons under the spiritual jurisdiction of the bishop of Liège who assented to the Truce of God (treuga Dei) being proclaimed throughout the diocese in 1082.
[e] In 1086, Conon also subscribed to the bishop's charter establishing a permanent tribunal to try high crimes such as abduction, rape, assault, robbery, arson and murder.
The 15th-century chronicler Jean de Stavelot, records that Dodon, the count of Laroche, refused to accede to the charter and besieged by the forces of the assenting nobles.
[2] In 1087, Conon was present in Aachen when the Emperor Henry IV took the collegiate church of Saint Servatius in Maastricht under his protection, confirmed its liberties and exempted its provostship from any other ecclesiastical jurisdiction.
When Otbert attempted to depose Theoderic II, abbot of Saint-Hubert, and appoint in his place Hildebrand, a monk of Lobbes, Conon led the noble opposition.
In 1095, Henry's successor, Bishop Otbert, purchased the county of Clermont from its count, Giselbert, and enfeoffed Conon's son Lambert with it.
He camped outside the city, while Conon, Baldwin of Le Bourg and Godfrey of Esch (Fredelo's son) met with Alexios in the palace.
[1] Alberic of Trois-Fontaines and Giles of Orval record the tradition that Conon was returning on a ship with Peter the Hermit and some men of Huy when they encountered a severe storm and vowed to build a church if they survived.
The storm immediately subsided, and the promise was kept when Conon and Peter founded the Augustinian canonry of Neufmoustier, dedicated to the Holy Sepulchre and John the Baptist.