Friedrich I of Württemberg was the son of George of Mömpelgard and his wife Barbara of Hesse, daughter of Philip I, Landgrave of Hesse.
Duke Frederick I of Württemberg and Sibylla of Anhalt (centre), with their then-living 5 sons: Johann Frederick, Ludwig Frederick, Julius Frederick, Frederick Achilles and Magnus (top left downwards), and 5 daughters: Sibylla Elisabeth, Eva Christina, Agnes, Barbara and Anna (top right downwards)
John George I was Elector of Saxony from 1611 to 1656. He led Saxony through the Thirty Years' War, which dominated his 45-year reign.
Monument to John George in Johanngeorgstadt
Engraving of John George I, Elector of Saxony. Anselm van Hulle
Engraving, Cornelis Danckaerts Historis, 1642