Margaret of Louvain (also known as Fiere Margriet or Margaretha de Trotse (Dutch); Marguerite la Fière (French); 1207–1225) was a servant murdered by thieves.

The couple had planned to enter the religious life, with Margaret herself set on joining a Cistercian convent.

[2] Margaret's killers had initially thrown her corpse into the Dyle, but it was recovered and buried on the riverbank where she was killed.

Miracles were later attributed to her at her tomb, and her remains were subsequently translated and reinterred in a chapel in the yard of Saint Peter's Church in the centre of town.

In the thirteenth century, Margaret's remains were buried in a coffin in a chapel set up for her and built against the choir of St Peter's Church.

In 1902 the shrine was made of gilded copper and adorned with semi-precious stones and co-financed by gifts from parishioners and young maids who honor Marguerite la Fière as their patron saint.