Landry was born in the 7th century in the pagus Hainoensis, Kingdom of Austrasia, Francia (now Hainaut Province, Belgium).

[3] Saint Landry maintained great regularity at the Abbey of Haumont founded by his father Madelgaire who later established another monastery in the forest of Soignies (now Collegiate Church of Saint-Vincent).

[5] With Saint Vincent's health declining, Landry was summoned from Meaux, who left his post to succeed his father in the religious role.

Saint Landry died on c. 17 April 692–700 AD in Soignies, pagus Hainoensis, Kingdom of Austrasia, Francia (now Hainaut Province, Belgium).

[7] On 1 October 1864, the shrine of Saint Landry, intricately carved and gilded in Renaissance style, was opened by Vicar General Charles-Joseph Voisin.