After his promotion to a Colonel on 17 August 1718, Kalckstein was assigned as the educator of the Prussian crown prince,
Frederick. In this position he became a conciliator in the conflict between King
Frederick William I and his son. However, he was ordered to keep a strict watch on the crown prince. After his wife, Christophera Erna Lukretia Brandt von Lindau, died on 25 January 1729, he was released from this position. == Later career ==