On the recommendation of Karl August von Hardenberg, the King commissioned him to head the unit charged with recovering art treasures that had been looted from Germany during the French occupation.
With the King's support, Ternite remained in Paris until 1823, continuing his artistic education in the workshops of Jacques-Louis David and Antoine-Jean Gros.
He also produced illustrations for Mariä Krönung und die Wunder des heiligen Dominicus by August Wilhelm Schlegel and made several copies of works by Raphael.
[1] Upon returning to Germany, he made the acquaintance of Count Gustav Adolf Wilhelm von Ingenheim, a collector of early Italian art, and accompanied him to Rome.
These were published at the urging of the Archaeologist, Karl August Böttiger, although the interest in Greek and Roman art was diminishing at the time they appeared.