Background
He was the second son of Count Friedrich VIII.
He was the second son of Count Friedrich VIII.
He was the ruling count of Hohenzollern from 1339 until his death. On 27 July 1342, he closed a treaty of agnatic seniority with the Zollern-Schalksburg line, in which the senior of the two counts should decide who would be the next holder of the original fief of Zollern. As Friedrich commanded a larger military power, he became a captain of the Lion League, an important organisation of Swabian noblemen.
In 1341 Fredrick IX married Adelheid (d after 1385), a daughter of Count Burchard V of Hohenberg-Wildenberg, with whom he had the following children:.
