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Author: WikiMatrix
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English[en]
On the basis of the Treaty of Vilnius (28 November 1561), he created the Duchy of Courland and Semigallia as a vassal state of the Grand Duchy of Lithuania, which was soon merged into the Polish-Lithuanian Commonwealth.
Swedish[sv]
På basis av Vilnaunionen (28 november 1561), omskapade han hertigdömet Kurland och Semgallen till vasallstat under storhertigdömet Litauen, som snart inlemmades i det polsk-litauiska samväldet.