Almare-Stäkets borg

The stone fortress stands on Stäksholmen island at a strategic position controlling the waterway between Stockholm and Uppsala through Stäksundet strait.

Built in the 12th century, the castle was destroyed in 1434 during internal conflicts, rebuilt by Archbishop Nils Ragvaldsson in 1440, and finally demolished in 1517.

The fortress, named after Saint Erik, represented the power struggle between Swedish church authorities and royal forces during the medieval period.

The remains of the castle present themselves as a plateau-like hill measuring 125 by 80 meters with foundations and house grounds visible in the northwestern section.

Archaeological diving expeditions discovered numerous logs and carved stones in the surrounding waters, with dendrochronological analysis dating them to the 14th and 15th centuries.

Location: Upplands-Bro Municipality

GPS coordinates: 59.46930,17.79258

Latest update: March 10, 2025 10:47