One of the most fascinating facts about Mont Saint-Michel Abbey is that its origin is attributed to a hole in a bishop's skull. According to legend, the Archangel Michael appeared to Bishop Aubert in 708 AD and, to prove his divine command, poked a hole in the bishop's head. The skull, with a visible indentation, is still displayed in a nearby church.
1. It Was Founded Because of a Dream (and a Hole in the Head)
The abbey's creation story is truly unique. In the early 8th century, Bishop Aubert of Avranches claimed the Archangel Michael appeared to him in a dream three times, demanding a church be built on the rocky islet then called Mont Tombe. Aubert initially dismissed the dreams, but the archangel grew impatient and allegedly left a physical mark on the bishop's skull to prove his point. This convinced Aubert, who consecrated the first sanctuary on October 16, 709.
2. The Abbey Was Never Conquered
Throughout the Hundred Years' War (1337-1453), Mont Saint-Michel became a formidable fortress. Despite being surrounded by English-controlled territory and facing numerous sieges, the abbey's strategic fortifications and the bay's treacherous tides made it impregnable. A small garrison of French knights successfully defended it against all attacks, making it a powerful symbol of national resistance.
3. It Was Once a Notorious Prison
After the French Revolution, the abbey was closed in 1791 and repurposed as a state prison, earning the nickname "Bastille of the Seas." It housed priests who refused to accept the new government, as well as political prisoners. The harsh conditions were notorious, but this use ironically saved the buildings from being quarried for stone, a common fate for abandoned monasteries. The prison was finally shut down in 1863.
4. The Tides are the Highest in Continental Europe
The bay surrounding Mont Saint-Michel experiences some of the most dramatic tides in Europe, with a difference of up to 15 metres between high and low water. During the highest tides (the 'grandes marées'), the sea completely surrounds the mount, making it an island once again. The tide is said to come in at the speed of a galloping horse, a legendary description of its rapid advance across the vast, flat sands.
5. Its Construction is an Architectural Miracle
Building a massive abbey on the peak of a conical granite rock was an immense challenge. Medieval builders achieved this by constructing a series of crypts and chapels at different levels to create a stable, level platform for the main abbey church above. The entire structure is a masterpiece of vertical architecture, with buildings wrapping around the rock in a seemingly impossible fashion.
6. The Abbey Has a Gothic Masterpiece Called 'The Marvel'
In the 13th century, a spectacular Gothic addition known as La Merveille ("The Marvel") was built on the north face of the rock. Funded by the King of France, this complex consists of two three-storey buildings housing the monks' refectory, scriptorium, and a stunning cloister that appears to float above the sea. It is considered a triumph of Gothic architectural design.
7. There is Another 'Mont Saint-Michel' in England
In the 11th century, the Benedictine monks of Mont Saint-Michel were granted an island in Cornwall, England, which bears a striking resemblance to its French counterpart. Known as St Michael's Mount, it became a priory of the Norman abbey. Though it was later confiscated by the English Crown during the Hundred Years' War, the two mounts remain historically and visually linked.
8. It is a UNESCO World Heritage Site... Twice Over
Mont Saint-Michel and its bay were first listed as a UNESCO World Heritage site in 1979 for their unique combination of natural and cultural importance. Twenty years later, the site was recognised again as part of the French section of the Routes of Santiago de Compostela pilgrimage trail, acknowledging its centuries-long role as a major destination for pilgrims.
9. A Community of Monks and Nuns Still Lives There
While no longer a Benedictine monastery, the abbey has been home to a religious community since 1966. Since 2001, the Monastic Fraternities of Jerusalem, a community of about a dozen monks and nuns, has lived and worshipped in the abbey, continuing a tradition of spiritual presence that stretches back over a thousand years.
Frequently asked questions
How old is the abbey at Mont Saint-Michel?
The first sanctuary was built in 708 AD. The main Benedictine abbey construction began in 966, with the Romanesque church foundation laid in 1023, making the core structure around 1,000 years old.
What is at the very top of Mont Saint-Michel?
The very top of Mont Saint-Michel is crowned by the spire of the abbey church, which is itself topped by a gilded statue of the Archangel Michael slaying a dragon. This spire was added in 1897 and reaches a height of 170 metres above sea level.
Why is Mont Saint-Michel so famous?
Mont Saint-Michel is famous for its dramatic location on a tidal island, its stunning medieval abbey, its architectural ingenuity, and its rich history as a major pilgrimage site, an unconquerable fortress, and a prison. Its designation as a UNESCO World Heritage site further solidifies its global importance.
Experience the wonder of this historic site firsthand. You can book tickets to explore the abbey at your own pace or join guided tours to uncover more of its secrets.