Bulverket
Bulverket Tingstäde träsk · Bulverket Lake Fortress · Tingstäde Träsk Bulverket · Bulverket Gotland Pile Fort
Medieval Gotland 12th c (1132) early Christian–Gotlandic Ting·Medieval Gotlandic chieftains (Gutar Christian early)·🇸🇪 Gotland County, Gotland island, Tingstäde parish on Tingstäde träsk lake (Lake Tingstäde 45 m a.s.l., central Gotland), Sweden
About
About Bulverket
Bulverket — unique Scandinavian lake pile fortress (c.1132 CE dendro-dated, Medieval 12th c) on Tingstäde Träsk lake, central Gotland, 18 km northeast Visby. Quadrangular 170×170 m pile platform with 4 gates, 25,000 pine piles 0.5 m diam driven into lake marl, house foundations oak, dock. Built c.1132 summer (dendro oak piles) by Gotlandic chieftains as Ting refuge — Gotlandic Ting assembly lake (Tingstäde name). Abandoned after few decades, submerged. Excavated 1920s Arwidsson–Nihlén, re-excavated 1980s–2000s. Sweden's only pile lake fort, compare Bulverket–Papau. Open-air reconstruction Tingstäde. Gotlandic Medieval anomaly.
Why it mattersScandinavia's only lake pile fortress — 25,000 piles 170×170 m dendro 1132 Ting refuge
Open questions
Mysteries & theories
Mysteries
- 01Why lake 1132 — Viking legacy or chieftain feud?
Theories
- 01Ting refuge for Gotland assembly vs trading post
Theories are interpretations, not findings. The seal above tells you how much scholarly weight the place carries.
History
How it came to be
- Built
- c.1132 CE summer (dendro 1131/32 oak piles) Medieval Gotland
- Period
- Medieval Gotland 12th c (1132) early Christian–Gotlandic Ting
- Culture
- Medieval Gotlandic chieftains (Gutar Christian early)
- Builders
- Gotlandic Ting chieftains (Tingstäde lake assembly builders)
- Purpose
- Lake pile assembly fortress 170×170 m 25k piles protecting Tingstäde Ting and trade
- Abandoned
- c.1150 decades later (submerged preservation)
- Rediscovered
- 1920s Arwidsson; dendro 1989
- Excavation
- Excavated
1132 summer
25k pine piles driven Tingstäde lake assembly fort 170×170 m
1150 CE
Abandon submerged preservation
1920s
Arwidsson excavation and reconstruction
On the ground
Structures & features
57.7360° N · 18.6420° E · 45 m · 3 mapped features
North Gate Pile Row
gateNorth gate 170 m pile row with oak threshold dendro 1132 summer
57.7365° N · 18.6420° ECentral House Platform
houseOak house foundations central 170×170 m platform Ting assembly
57.7360° N · 18.6425° ELake Dock and Piles
dock25,000 pine piles 6 m long dock on Tingstäde Träsk marl
57.7355° N · 18.6420° E
Gallery