Frederick Casimir Kettler was Duke of Courland and Semigallia from 1682 to 1698. Frederick Casimir was the son of Jacob Kettler and Louise Charlotte of Brandenburg.
In his reign the Duchy lost its geopolitical position and became Sweden, Prussia... Wikipedia
Born: July 6, 1650, Jelgava, Latvia
Died: January 22, 1698 (age 47 years), Jelgava, Latvia
Great-grandparents: Gotthard Kettler, Anna of Mecklenburg, John Sigismund, Elector of Brandenburg, and more
Parents: Jacob Kettler and Princess Louise Charlotte of Brandenburg
Great grandchildren: Støvlet-Cathrine, Johann Ludwig Graf zu Sayn-Wittgenstein-Hohenstein, Marie von Anhalt-Bernburg, and more