Raseborg Castle: A Medieval Fortress in Finland
Site at a Glance
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- Finland
- Primary era
- Medieval
- External website
- Open
- Eras represented
- Medieval
- Civilizations
- Swedish
- Site type
- Military
- Remains
- Castle
On this page14 sections
History
Raseborg Castle is a medieval fortress in Finland, located at Snappertuna within the modern city of Raseborg. Built by Swedish power in the 1370s, it protected interests in southern Finland and controlled access toward the Gulf of Finland and the waterway to Reval, the medieval name for Tallinn. Construction is mentioned in 1373, while the first official documentary reference dates from 1378.
Foundation and Swedish rule
The castle was initiated by Bo Jonsson Grip, a leading Swedish nobleman who served as a royal councillor and marshal. Its position was intended to protect regional trade routes and Swedish influence against Russian power, as well as Danish and German interests. A competing tradition connects the foundation with the German Baltic crusades, Bishop Hermann I of Buxthoeven, and the Livonian Brothers of the Sword, a medieval military order active in the eastern Baltic. This interpretation also links the name Raseborg with the diocese of Ratzeburg near Lübeck.
After Bo Jonsson’s death, the castle and most of his fiefs reverted to the Swedish Crown in 1388. Its strong position made it desirable to powerful nobles, and control changed repeatedly during the political conflicts of the late fifteenth century. Raseborg remained active from the 1370s until the 1550s and reached its height during the fifteenth century.
During the early fifteenth century, population growth led to the development of a larger village on the northern bank of the river. The original settlement could no longer supply the castle adequately. During Otto Pogswisch’s tenure as royal castle captain, the garrison, the military force stationed at the fortress, was reportedly first instructed in the use of cannon. Pogswisch fled to Tallinn during the Engelbrekt uprising in 1434, and Nils Christersson held the castle briefly afterward.
Conflict and royal residence
In June 1437, the deposed king Eric of Pomerania seized Raseborg with a pirate league of 200 men. Eric had ruled Denmark, Norway, and Sweden before losing those thrones, and he intended to recruit an army and recover Stockholm. He abandoned the castle in August after learning that a fleet from Tallinn was preparing to attack, then withdrew to Gotland.
Karl Knutsson held Raseborg from 1442 to 1448 and again during later political conflicts. As King Charles VIII of Sweden, the name used for Karl Knutsson during his reign, he spent most of two periods of exile at the castle, from 1457 to 1464 and from 1465 to 1467. He maintained his court there and enlarged and strengthened the fortress.
In 1465, the widowed king began a relationship at Raseborg with Kristina Abrahamsdotter, the daughter of the local judge Abraham Persson. Their children Karl and Anna were born at the castle. Charles married Kristina on his deathbed in May 1470. After his death, she returned to Finland with their children.
Katarina Eriksdotter Nipertz held the castle with her children from 1482 to 1487. In 1487, the Swedish nobleman and regent Sten Sture surrounded Raseborg with troops and a fleet. After the siege, its female holder surrendered. The castle changed hands several times between 1483 and 1490, often through violent conflict. Tönne Eriksson became its lord in 1490 and held it for about twenty years. He was also recorded as castle bailiff or commander from 1492 to 1513, an office responsible for administering the fortress and its associated territory.
War, decline, and abandonment
During the early sixteenth-century conflicts between Sweden and Russia, boats based at Raseborg disrupted Russian shipping bound for Novgorod in the Inkoo archipelago. Russian forces also attempted to besiege the castle but were unsuccessful.
In 1520, during the conflict surrounding the Kalmar Union, the late-medieval political union of Denmark, Norway, and Sweden, the Danish king Christian II occupied Raseborg for three years. On 16 December 1520, Bishop Hemming Gadh and the castle’s lord, Nils Eskilsson Banér, were beheaded at the gallows hill outside Raseborg.
Gustav Vasa’s forces recaptured the castle in 1523. Raseborg was then granted to Erik Fleming, who repaired it after a period of serious decay and held his court there by 1530. In 1540, following complaints from peasants in the castle district, Raseborg and its lands returned to royal ownership.
The castle’s regional role weakened as administrative and defensive functions moved elsewhere. Ekenäs became the district’s administrative centre in 1546, and Helsinki was founded in 1550. Trade-route protection shifted to Häme Castle, eastern frontier defense to Olavinlinna, and maritime control to the Swedish fleet in the Gulf of Finland.
Raseborg became largely depopulated during the 1550s. A record states that the last prominent resident, a clerk named Bengt, left with a small retinue on 3 March 1553, leaving the castle open and deserted. Repairs continued for a time, but structural collapses in 1558, including the failure of one or more vaults and the beer cellar roof, led to its final abandonment. In the 1690s, during the Russo-Swedish wars, the ruins housed food and ammunition stores belonging to the local regiment command.
Restoration and modern identity
Restoration began in 1839 under Magnus Schjerfbeck, with particular attention to strengthening the walls and rebuilding the round residential tower. Further work took place in the 1930s, 1960s, and 1980s, with the latest major restoration completed in 1988. Since 1966, an outdoor theatre beside the ruins has presented performances connected with the castle or its period, often in Swedish. The modern city of Raseborg was re-established on 1 January 2009 through the merger of Ekenäs, Karis, and Pohja.
Remains
Island setting and early fortress
Raseborg Castle was originally built on a rocky island in the Raseborg River, approximately 3 to 5 kilometres from the river’s mouth at the Gulf of Finland. Medieval water surrounded the castle complex, including the adjacent Stallholmen. The approach could be closed with iron chains, while wooden piles around the castle and harbor helped prevent hostile boats and ships from drawing near.
The castle stood on a rocky outcrop about 14 metres above the surrounding terrain. Its northern and western sides rose on steep rock approximately 4 to 5 metres above the river, making those approaches difficult to assault during the early occupation phase. Postglacial land uplift, the gradual rise of land after the Ice Age ice sheet disappeared, changed the setting. The castle now stands beside the river, about 50 metres from its bank, and the once-navigable waterway has nearly silted up. The river’s present average depth is about 1.5 metres.
Early horseshoe fortification
The earliest castle was built between about 1378 and 1400 as a small horseshoe-shaped fortification. Its first large tower and the smaller towers of the inner castle belong to this phase, whose remains are comparatively well preserved. The ground plan has a curved northern side and an open southern side. It has also been compared in outline to a capital letter D, with a thick-walled round keep, the principal strong tower of a castle, at one corner and the straight side formed by the main fortress.
Inner castle and residential spaces
The inner courtyard is narrow and approximately rectangular. The principal windows opened toward this space, while the main residential rooms occupied the southern side. Window and door openings were pointed-arched. Visible stone foundations within the courtyard belonged to residential buildings probably used by higher-ranking castle dependants and members of the garrison.
Round residential tower
The south-eastern side formed the strongest part of the fortress and contained a round residential tower that was originally several storeys higher than it is today. The tower was rebuilt during the restoration begun in 1839, while the surrounding walls were strengthened in later phases. Its present form therefore combines surviving medieval fabric with reconstructed elements.
Outer defenses and water barriers
The southern and eastern sides were additionally protected by an outer castle built during Charles VIII’s residence. This area was used partly by servants and other castle dependants. Its defenses included an external wall with a square tower and a barbican, an outer defensive work protecting an entrance or wall. The surviving outer wall is understood to have protected the foundations and lower walls of the main castle, particularly as artillery became more common.
Landward ditch
A water-filled ditch approximately 300 metres long and 12 to 18 metres wide made the castle inaccessible from the landward side. On another island east of the castle stood barns and other service buildings. Changes in the river’s course and the uplifted terrain have left parts of these former water defenses on dry land.
Stallholmen settlement
A smaller island opposite the eastern wing was connected to the castle by a wooden passage. Soon after the fortress was built, a settlement of approximately five or six houses developed there to serve its inhabitants. The island was also called Stallholmen, or Stable Island, and probably accommodated horses belonging to people arriving at or leaving the castle. The castle’s unusually narrow gateways reflect the delivery of provisions by boats, barges, and ships rather than by horse-drawn transport.
Extensive wooden piles surrounded the castle complex and Stallholmen to prevent hostile vessels from approaching the harbor. Some piles remain visible near the castle, although the land around them was formerly a waterside peninsula or island. Their position illustrates how changes in the shoreline altered the physical setting of the medieval fortress.
Materials and restored fabric
The castle was built principally of stone and brick. In the 1980s, the outer walls of the inner castle were reconstructed to approximately their presumed original height of 15 metres. Reconstructed wooden stairs, terraces, railings, and floors now make the interior accessible. The restored ruin also retains reconstructed or restored floors, galleries, stairs, and roofed interior spaces, while the original appearance of the castle remains uncertain.
