Duchy of Saxe-Altenburg
The death of his father Prince Moritz on 13 May 1907, made Prince Ernest the Hereditary Prince of Saxe-Altenburg, and nine months later (7 February 1908) with the death of his uncle Duke Ernest I he became in the new ruler of the Duchy of Saxe-Altenburg as Ernest II. Then, the whole family moved from Potsdam to Altenburg. George Moritz, now Hereditary Prince, lived at the Ducal court until March 1913, when his father sent him to Dresden to continue his education at the King Georg High School (German: "König-Georg-Gymnasium"); in addition to this, he received his military training at the 8th Thuringian Infantry Regiment N°153.