Sailly-sur-la-Lys is a large farming and light industrial village situated some 9 miles (14 km) northeast ofBéthune and 12 miles (19 km) west northwest ofLille, at the junction of the D945 and D66 roads. The riverLys forms much of the western and northern boundary of the commune.[4]
The sixteenth century Prévôté; the oldest building in the town. English:provost’s house.[8]
The prévôté is a fortified building located by the parish cemetery, near the Lys. It includes the remains of the prison and the courts of justice. A chapel dedicated to the Virgin complements the construction. The gateway, which was destroyed in the sixteenth century and rebuilt in 1612, is defended by two towers with mullioned windows. Before theFrench Revolution, it was the provost that represented theabbot of Saint-Vaast in all matters civil and judicial.