skos:altLabel | - Frederick Casimir
- Friedrich Casimir
- Friedrich Kasimir Kettler, Duke of Courland and Semigallia
- Frederick (II) Casimir
- Frederick Casimir Kettler, Duke of Courland
- Frederick Casimir of Courland
- Frederick Casimir, Duke of Courland
- Frederick II Casimir Kettler
- Frederick Casimir Kettler, Duke of Courland and Semigallia
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