Upon the death of Albert Frederick in 1618, who died without male heirs, John Sigismund was granted the right of succession to the Duchy of Prussia, which was still a Polish fief.
Upon the death of Albert Frederick in 1618, who died without male heirs, John Sigismund was granted the right of succession to the Duchy of Prussia, which was still a Polish fief.
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Після смерті Альберта Фрідріха в 1618 році, який помер без спадкоємця, Іоан Сигізмунд отримав право на успадкування Прусського герцогства, яке на той час ще було васалом Польщі.
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