Prince interrupted his service in Africa by several stays in Germany. There he married Magdalene von Massow, who went with him to Africa. In 1896 he was promoted to the rank of captain. Prince also worked in the district authorities of German East Africa, including as government commissioner at Nyassa Lake and later in the region of Iringa. Around 1900, Prince left the protective force and colonial administration to settle as landowner in East Africa. Together with his wife, he founded a plantation near Sakkarani in the Usambara Mountains. In 1906, Captain von Prince was raised to the German nobility.