Karl of Södermanland received his duchy as an appanage from his father Gustav Vasa in 1560, but the arrangement was constitutionally ambiguous from the start — Swedish dukes held administrative authority without true sovereignty, which didn't stop Karl from issuing coinage as though he had it. His brother King Johan III repeatedly contested this prerogative, and the tension between them over ducal rights to mint coin was never cleanly resolved during Johan's lifetime.
Karl would eventually depose his nephew Sigismund and rule Sweden as Karl IX from 1604. The 1587 date places this piece squarely in the middle of that long, fractious buildup.
Karl of Södermanland received his duchy as an appanage from his father Gustav Vasa in 1560, but the arrangement was constitutionally ambiguous from the start — Swedish dukes held administrative authority without true sovereignty, which didn't stop Karl from issuing coinage as though he had it. His brother King Johan III repeatedly contested this prerogative, and the tension between them over ducal rights to mint coin was never cleanly resolved during Johan's lifetime.
Karl would eventually depose his nephew Sigismund and rule Sweden as Karl IX from 1604. The 1587 date places this piece squarely in the middle of that long, fractious buildup.