By 1194, Lambert was the parish priest of Ardres. He was related to the Counts of Guînes, for whom he wrote a Historia comitum Ghisnensium, begun around 1196 and left unfinished in 1203. It is a mixture of history and folklore. It also contains a contemporary description of a donjon. A chapter of Georges Duby's The Knight, The Lady, and the Priest is dedicated to Lambert's Historia.
