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From sacred site to community: This island surprises researchers yet again

For centuries, Selja has been known as Norway’s oldest pilgrimage site.  Researchers have now uncovered the remains of yet another previously unknown structure outside the monastery complex.

Stone ruins and a newly found wall on Selja, set on a hillside above the coast.
A thick wall is the second discovery made outside the known monastery ruins.
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The discovery strengthens the emerging picture that far more activity took place on the island than the ruins alone have revealed.

This is the third major find at the site in just a few years.

Discovery reveals an unknown life beyond the monastery walls

The Selja monastery and pilgrimage site has been studied and documented by researchers, heritage specialists, and archaeologists for nearly 200 years.

Even so, the island continues to surprise.

In recent years, researchers have uncovered several previously unknown buildings and structures connected to the medieval complex. NIKU building archaeologist Regin Meyer has worked closely with experts in digital archaeology.

Another discovery can now be added to that list.

The newly identified structure is located outside the known monastery walls.

The casing wall is two metres wide and can be traced for thirteen metres in the dataset.

It consists of a substantial stone wall foundation which, according to ground-penetrating radar data, extends from the harbour area and at least thirteen metres southwards across the terrain.

“The wall is two metres thick which indicates a very substantial construction,” says Meyer.

So far, only parts of the wall have been investigated. The structure continues below ground, and researchers do not yet know its full extent.

Selja monastery and pilgrimage site

  • Location: Selja, Stad Municipality, Norway.

  • Historical significance: Home to Norway’s oldest known saintly cult, initially associated with the Selja Men (Seljemennene) and later with the legend of St. Sunniva.

  • The saint’s legend: According to the saga, Sunniva and her companions were shipwrecked on Selja in the mid-10th century. They took refuge in a cave, where they died as martyrs.

  • Ecclesiastical development:

    • Olav Tryggvason is said to have discovered holy relics on the island and built a church there in 996.

    • Olav Haraldsson (later St. Olav) arrived at Selja from England in 1015 in connection with the Christianisation of Norway and his claim to the throne.

    • The Feast of the Selja Men (Seljumannamessa) was reportedly established in 1024.

    • Around 1068, Olav Kyrre established Western Norway’s first bishopric on the island.

  • Monastic complex: The Benedictine monastery was gradually expanded throughout the 12th, 13th, and 14th centuries.

  • St. Sunniva’s Church: The ruin contains evidence of an earlier stone church with Anglo-Saxon features, possibly Norway’s very first stone church.

Age and function remain unknown

It is still too early to determine the building’s function.

Researchers don’t know whether it can be linked to the Benedictine monastery, the bishopric established on Selja in the 11th century, or the earliest phase of the sacred site associated with the cult of the Selja Men.

Meyer has collected both datable material and soil samples from the area. The goal is to determine the age of the structure and gain further insight into the activities that took place there.

“Hopefully, the analyses will help us understand both the date and function of the structure, and the role it may have played in the development of the site,” he says.

Stone ruins of St. Sunniva Church on a hillside above the coast, with a person examining the foundation.
The ruins of St. Sunniva Church. Regin Meyer made an exciting discovery in the church foundation.

The discovery changes our understanding of the site

Selja is one of Norway’s most important medieval sites. The island is associated with Saint Sunniva, the Selja Men, and the early Christianisation of Norway.

Selja eventually developed into a bishopric, a pilgrimage destination, and a monastery complex.

Traditionally, attention has focused on the large ruins that still dominate the landscape.

The site now appears to be more extensive than previously assumed.

The newly discovered structures fit into a pattern of findings that is gradually expanding our understanding of the site.

The findings suggest that Selja was not only a religious centre. The island was also a vibrant environment with diverse forms of activity and settlement.

People working in a grassy field beside a stone tower, with tripods and equipment nearby.
An interdisciplinary collaboration led to one of the most significant discoveries on Selja in the past 200 years.

The third major discovery in just a few years

This is not the first time recent investigations on Selja have produced surprising results.

In 2024, NIKU announced the discovery of traces of an earlier stone church (link in Norwegian) within the ruins of St Sunniva’s Church.

The investigations indicated that the building featured construction characteristics with clear parallels to the Anglo-Saxon building tradition and may represent one of the earliest stone churches in Norway.

Shortly afterwards, researchers also identified a previously unknown medieval building northwest of the monastery. The discovery demonstrated that significant traces of settlement still survive in areas that had never previously been recorded.

The latest discovery builds on this research and highlights the considerable potential for new knowledge that still exists on the island.

Person operating ground-penetrating radar in a grassy field near a stone tower on Selja.
The ground-penetrating radar survey conducted on Selja in the spring of 2022 provided the starting point for the new discoveries.

Digital technology reveals the hidden past

These discoveries are the result of close collaboration between NIKU’s building archaeologists and specialists in digital archaeology. They are exploring the past using new technology.

Using new documentation methods, terrain modelling, remote sensing, and detailed analyses of the landscape and ruins, researchers can identify traces that previously went unnoticed.

These methods make it possible to re-examine well-known cultural heritage sites.

“Selja is a good example of how even among Norway’s best-known medieval sites, important stories are still waiting to be discovered,” the archaeologist points out.

A stone tower with a blue roof sits inside a low stone wall on a grassy hillside.
Archaeologists have uncovered several previously unknown structures hidden beneath the ground. Shown here is the discovery of a stone building outside the monastic complex in 2025.

A broader picture of medieval Selja

This year’s discovery helps paint a more nuanced picture of life on Selja.

Research has traditionally focused on churches, monastic buildings, and pilgrimage activity. The new evidence points to other activities and functions that are not yet fully understood.

“This shows that we still know only part of Selja’s story. The discoveries provide insight into activities that took place beyond the monumental buildings and raise new questions about the people who visited, lived, and worked here,” says Meyer.

Three new discoveries on Selja

  • 2024: Evidence of an earlier stone church with Anglo-Saxon features was uncovered within St. Sunniva’s Church.

  • 2025: A previously unknown medieval ruin was identified near the monastic complex.

  • 2026: A newly discovered structure outside the monastery walls is helping to reveal previously unknown activity and settlement on the island.

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