Birger Jarl is believed to have turned a citadel into a royal castle in the mid-13th century, though the article marks this as uncertain. The name Tre Kronor is believed to date from the mid-14th century, under Magnus Eriksson. It became Gustav Vasa's most important royal seat. John III rebuilt it in the Renaissance style and added a castle church. The article says it was built of wood and copper, and names no architect.
It had a main section and walled gardens around a central high tower. A major fire on May 7, 1697 destroyed most of the castle, along with most of Sweden's national library and royal archives. Its cause is blamed on negligence, though the claims carry citation tags.
Stockholm Palace was built on the site, with Nicodemus Tessin the Younger in charge, completed in 1754.
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