Archaeologists in France have discovered the body of a noblewoman that was well-preserved after dying 350 years ago.

The corpse was found to be Louise de Quengo, a widow from an aristocratic family in Brittany. Her body was found in a hermetically sealed lead coffin in a tombstone at a convent chapel in Rennes, still dressed in her clothes, including her cap and shoes.

Other findings from site of the Saint-Joseph chapel include four lead coffins dating from the 17th century and 800 other graves containing skeletons, The Guardian reported.

The research team said they found her body next to the heart of her husband, nobleman Toussaint Perrien, according to the Daily Mail.

The autopsy showed that Quengo had kidney stones and lung adhesions and that her husband's heart was taken out through surgery.

Her decayed clothes have been restored and are set to be put on display.

Researchers believe that Quengo chose to live out her remaining days at the convent, The Local reported. The widow's outfit when she was found included a cape, a coarse habit, a linen shirt, cork-soled shoes, woollen breeches, a shroud over her face and several caps.

Quengo's corpse is scheduled to be reburied in Rennes in a few months.