Landelin was a 7th-century Benedictine abbot born in Vaulx-Vraucourt. After a period of worldly living and banditry, he underwent a religious conversion following the death of a companion. Under the guidance of Bishop Aubert of Cambrai, he lived a life of penance and eventually dedicated himself to monasticism. He is primarily recognized for establishing several religious houses, including the abbeys of Lobbes, Crespin, and Aulne, to serve the community and make amends for his earlier life.