Ernestine duchies
Johann II, Duke of Saxe-Weimar (or John II), died young but left eight surviving sons who ruled together,  Three died, (including Bernhard of Saxe-Weimar, the youngest, the famed general) and a will ordering them to rule jointly. Only three survived by 1639, when the lands of the Coburg-Eisenach dukes were divided between the Altenburgs and the Weimarsthe remaining brothers finally divided their lands which were twice the size of what they inherited.