Clan Rising
Almare-Stäkets borg today

Sweden · Ruin

Almare-Stäkets borg

Almarestäket's castle (Sankt Erik's castle) is a medieval castle ruin on a low plateau in Upplands-Bro municipality, Stockholm County, Sweden. It stood at the strategic Almarestäket strait at the inlet to Lake Mälaren and is listed as an ancient monument by the Swedish National Heritage Board.

Photograph via Wikimedia Commons

Its prime

1510

Today

Ruin

As it stood in 1510

What Almare-Stäkets borg looked like in its prime.

A compact stone-and-brick fortress occupying a plateau roughly 125 × 80 metres and 3–4 metres high, its built area concentrated toward the northwestern quarter where house foundations cluster. A continuous curtain of masonry ran along the western slope, now visible as a string of fallen blocks. The summit held courtyards and ranges of stone-built domestic buildings; the hilltop commanded direct views over the Almarestäket strait and the approaches to Görväln.

Its story

The story of Almare-Stäkets borg.

Built for Sigtuna and Uppsala in the Twelfth Century

A castle was raised during the 12th century on Stäketsholmen, then an island, and served as a defence work for the towns of Sigtuna and Uppsala. It sat on the choke point of Almarestäket, the strait at the inlet to Lake Mälaren, where the important waterway between Stockholm and Uppsala ran, and whoever controlled the waterways controlled the kingdom. Named after Eric IX, it was also known as Sankt Erik's castle, and it was once counted among Sweden's strongest and most talked-about castles. Through the whole of the Middle Ages there was a constant tug-of-war between the king and the church over who should rule it.

Burned in 1434, Rebuilt from 1440

The castle is first mentioned at the end of the 14th century, and the rhyming chronicle Karlskrönikan describes it as burned down on the night of 11 November 1434 by Eric Nipertz. He acted on the orders of Erik of Pomerania and of Hans Kröpelin, captain of Stockholm Castle. The point of the burning was to keep Engelbrekt Engelbrektsson's troops from taking the place.

In 1440 Archbishop Nils Ragvaldsson was given permission to build a new castle on the site. It stood finished about ten years later.

Sten Sture Against Gustav Trolle, 1516–1520

During the domestic political strife of the 1510s the castle was in the hands of Gustav Trolle, and in 1516–17 it was besieged by his chief opponent, Sten Sture the Younger. In 1517, in the face of an open threat of excommunication, Sten Sture forced through a ruling that the castle should be demolished.

The demolition had evidently been carried out by 1519, when brick from Almarestäket is recorded as having been shipped to Stockholm for reuse. The affair became the prelude to the Stockholm Bloodbath of 1520.

What Survived the Demolition

What is left is a plateau-like hill roughly 125 by 80 metres across, carrying traces of foundations and house footings at its north-western end and, on the western slope, a line of blocks that may come from a collapsed wall. Below the hill stands an obelisk of red granite about five metres high, raised in 1804. The ruin is protected as an ancient monument in the register kept by the Swedish National Heritage Board.

Step inside

6 places to explore in 1510.

The record describes 6 distinct spots at Almare-Stäkets borg, including the full exterior approach. Create your own photoreal reconstruction and explore every one, more scenes means more rooms, more angles, and more of the place to stand in.

Approach across the southern slopeSummit plateau overlooking the straitNorthwestern domestic foundations and rangesWestern slope and outer wallBridge and foot of the hillShoreline and control of the strait

Build Your Own Castle

Recreate Almare-Stäkets borg with AI to explore it.

The artist rebuilds it as it stood in 1510, a photoreal reconstruction that belongs to you alone. Pay with coins, no subscription needed.

Recreate this castle →Defend this castle →

Questions about Almare-Stäkets borg

What is the history of Almare-Stäkets borg?

Almare-Stäkets borg began as a 12th-century castle on Stäketsholmen, built as a defence facility for Sigtuna and Uppsala. It controlled an important waterway between Stockholm and Uppsala, making it a focus of conflict between the king and the church. Gustav Trolle held it during the political strife of the 1510s, before Sten Sture the Younger besieged it in 1516–17 and it was demolished in 1519.

Why was Almare-Stäkets borg built, and what was it used for?

Almare-Stäkets borg was built to defend Sigtuna and Uppsala and to control the important waterway between Stockholm and Uppsala. Its position at the Almarestäket strait gave whoever controlled it command of the waterways and influence over the kingdom. During the Middle Ages, the king and the church contested control of the castle.

Where is Almare-Stäkets borg?

Almare-Stäkets borg is in Upplands-Bro Municipality, in Stockholm County. The ruin stands on the former Stäketsholmen, at the Almarestäket strait and the inlet to Lake Mälaren. It overlooks the strait and the approaches to Görväln.

When was Almare-Stäkets borg built?

Almare-Stäkets borg was first built in the 12th century. The original building date is not recorded as a specific year, and the castle was later rebuilt: Archbishop Nils Ragvaldsson received permission to construct a new castle in 1440, completed about ten years later.

Was Almare-Stäkets borg ever attacked or besieged?

Almare-Stäkets borg was besieged by Sten Sture the Younger in 1516–17 while Bishop Gustav Trolle held it. In 1517, Sten Sture enforced a decision that the castle should be demolished, and the demolition was carried out in 1519. The record does not state that the castle fell during the siege itself.

What did Almare-Stäkets borg look like in its prime?

In its prime, Almare-Stäkets borg was a compact stone-and-brick fortress on a plateau about 125 by 80 metres and 3–4 metres high. Its buildings were concentrated in the north-western quarter, where house foundations and domestic ranges clustered. A continuous masonry curtain ran along the western slope, while courtyards and stone-built buildings occupied the summit.

Is Almare-Stäkets borg still standing or is it a ruin?

Almare-Stäkets borg is now a medieval castle ruin. The surviving site is a plateau-like hill measuring about 125 by 80 metres and 3–4 metres high, with foundations and house foundations visible in the north-western part. Fallen blocks along the western slope may come from a collapsed wall, while the castle itself was demolished in 1519.
All castles of Sweden · Castles of Europe · the best castles in Europe · explore the finished reconstructions.