More than 4,000-year-old stone slabs measuring 2 x 1.5 m were discovered by archaeologists as early as 1900 during excavations at the prehistoric cemetery of Finistère in western Brittany. It was then found by the local archaeologist Paul du Chatellier. His collection was then bought by the National Museum of Antiquities (MAN) in 1924, and by 2014 the plaque was lost.
It was not until 2014 that scientists rediscovered it in the cellar of Saint-Germain-en-Laye Castle, northwest of Paris. The plaque, which was then known as the plaque of Saint-Bélec, probably dates from the early Bronze Age, ie from 1900 BC – 1650 BC