The Basilica of Saint-Sernin was originally built to house the relics of Saint-Saturnin, the first bishop of Toulouse. In the 11th century, the influx of pilgrims to the tomb of the holy martyr made it necessary to build a new, much larger church.
And so, in the 1070s, the foundation stone was laid for the immense basilica that now welcomes us. The name Saturnin has undergone many changes over the centuries to become Sernin today.