[citation needed] At the age of 12, Ernst Casimir attended the Royal Prussian Pädagogium in Halle.
After passing Maturum in 1826, Ernst Casimir studied first at the University of Giessen and later at the Berlin College of History and Archeology.
To learn the French language, he held temporarily studied in Basel and Geneva.
Ernst Casimir also served for several years in the Imperial and Royal Army of the Austrian Empire.
On 1 November 1848, succeeded to the title of Prince of Ysenburg and Büdingen upon the abdication of his father.