After Maud's death, Waleran married Bona of Bar (d. 1400), daughter of Duke Robert of Bar and Marie of Valois (daughter of John II of France), but they had no children. He was one of the peace commissioners sent to London in 1396. On 30 December 1396, Waleran was made governor of Genoa.[6]
Waleran wrote Henry IV of England a letter on 9 November 1403, stating his intentions to attack England.[5] He declared a personal grudge against the man who had killed and replaced, his relative, Richard II.[5] He blockaded Calais in 1403, stopping all overland commerce into the town ordering the arrest of any English merchants.[5] Later in 1405, he made a futile attack on the English at Mercq near Calais.[7]
Waleran was of the party of Philip II, Duke of Burgundy, marrying his daughter to Philip's son Antoine. Under the Burgundians he obtained preferment, becoming Grand Maître des Eaux et Forêts, the governor of Paris in 1410, and Constable of France in 1411.[8] However, he lost the Constableship and was driven from Paris with the rest of the Burgundians in 1413. He died in 1415 and was succeeded by his grandson Philip of Saint-Pol.
Boffa, Sergio (2004). Warfare in Medieval Brabant, 1356-1406, Volume 17. The Boydell Press.
Bubenicek, Michelle (2002). Quand les femmes gouvernent: droit et politique au XIVe siècle (in French). Ecole de Chartes.
Given-Wilson, Chris (2008). "The Quarrel of Old Women": Henry IV, Louis of Orleans, and Anglo-French Chivalric Challenges in the Early Fifteenth Century". In Dodd, Gwilym; Biggs, Douglas (eds.). The Reign of Henry IV: Rebellion and Survival, 1403-1413. York Medieval Press.
Sumption, Jonathan (2015). The Hundred Years War. Vol. 4: Cursed Kings. Faber & Faber.
Taylor, Craig (2019). A Virtuous Knight: Defending Marshal Boucicaut (Jean II Le Meingre, 1366-1421). York Medieval Press.
Vaughan, Richard (2009). Philip the Bold. The Boydell Press.
Warner, Kathryn (2017). Richard II: A True King's Fall. Amberley Publishing Limited.
de Wavrin, Jean (2012). Hardy, William (ed.). Recueil Des Chroniques Et Anchiennes Istories de la Grant Bretaigne (in French). Vol. 3: From A.D. 1422 to A.D. 1431. Cambridge University Press.