(Johann Maria Wilhelm; 22 May 1570 – 18 July 1605) a Duke of Saxe-Weimar and Jena.

Johann Wilhelm (11 March 1530 – 2 March 1573) was a duke of Saxe-Weimar.

Johann Ernst of Saxe-WeimarHe is occasionally referred to as Johann Ernst IV (for example, in the Allgemeine Encyclopädie der Wissenschaften und Künste, Leipzig 1842, II./21., p. 260: article by J S Ersch), implying that he succeeded his father as co-ruler of Saxe-Weimar with his half-brother Ernst August I, both under the regency of their uncle Wilhelm Ernst; this is not well-evidenced.

Friedrich Wilhelm I (25 April 1562 in Weimar – 7 July 1602 in Weimar) was a duke of Saxe-Weimar.

Wilhelm, Duke of Saxe-Weimar (Altenburg, 11 April 1598 – Weimar, 17 May 1662), was a duke of Saxe-Weimar.