Reichsfürst
Johann von Hohenzollern-Sigmaringen (1578–1638), the son of Charles II was the count of Hohenzollern-Sigmaringen from 1606 until 1623. Then in 1623 the family was promoted from Count (German: "Graf") to the rank of Princes of the Holy Roman Empire (German: "Reichsfürst"). Johann then became the first prince (German: "Fürst") of Hohenzollern-Sigmaringen.