Construction started in 1475, and the article names no founder, but it cites a 1477 letter from Tott about foreign builders invited to Olofsborg, probably from Reval. The three-towered keep was completed in 1485, and the outer curtain walls with two towers in 1495. The plan is a truncated rhomboid on an island among lakes. The article gives no materials or dimensions.
The article says it was the first Swedish castle with thick circular towers designed to withstand cannon fire. It was never taken by force, though the garrison surrendered on negotiated terms in 1714 and 1743. In the late 18th century it was converted into a Vauban-style fort with bastions.
St. Erik's Tower had a poor foundation and has collapsed, and the Thick Tower exploded in 1791. Fires in the 19th century destroyed much of the decor and all original furnishings. The castle now hosts a Castle Museum and an Orthodox Museum.
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