On the 17th of September 1856 (326 years after Margaret's death) the entrance to the vault at Brou was accidentally discovered in raising some flagstones near Philibert's monument, and on December the 1st of the same year it was opened in the presence of a committee of ten persons. Count E. de Quinsonas, who was present, gives an interesting account of the visit of inspection. The vault, which had not been opened since Margaret's coffin had been placed there in 1532, was entered by a flight of steps from the choir. The three coffins were found exactly under their respective monuments in the church above; Duke Philibert of Savoy's in the centre, Margaret of Bourbon's on the right, and Margaret of Austria's on the left. Philibert's coffin was intact, and of a great length, but those of the two princesses had broken open, and their remains were scattered on the floor of the vault. The three coffins rested on iron trestles. Margaret of Bourbon's coffin was of lead, shaped like an elongated square, but had originally had an outer coffin of oak, the remains of which lay on the ground. The princess's skull was intact, and showed a tress of chestnut hair. The inscription on the leaden coffin was in French as follows:-- IHS MARIA S Marguerite de Bourbon 1483 ce 27 Avril fut esevelie. Philibert's coffin was found in a perfect state of preservation, in shape similar to that of Margaret of Bourbon, but of gigantic size. The duke's body had been placed in an oaken coffin enclosed in lead, which probably accounted for its preservation; whilst the two princesses had been laid first in lead and then in oaken shells, the outer cases of which had rotted away from the damp, and the inner coffins had broken open. The following is the inscription on Duke Philibert's coffin:-- + IHS MARIA S Cy gist, tres excellent et tres puissant prince Philibert. Due de Savoye IIe de ce nom. tres vertueux le quel trespassa et r[=e]dist lesperit a Dieu l[=a] mil Ve et quatre le Xe jour de Septembre au chasteau du Pont Deyns et fust enterre ceans le XVIe du dit mois. pries Ntre Seignr pour luy. Margaret of Austria's leaden coffin had also originally been enclosed in one of oak, and was shaped like a mummy case to the form of the body. The inscription on the coffin was as follows:--