1246年腓特烈二世公爵死后，男系绝嗣，家族的势力迅速没落。
With the death of Duke Frederick II in 1246, the male line ended, and the family's power declined rapidly.
古堡最古老的部分于1560年由国王菲德烈二世建造。这也就是菲德烈古堡得名的由来。
The oldest parts of the castle date back to 1560, and were built by King Frederick II, after whom the palace is named.
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