Frederick II, Count of Zollern (died: 1142[1] or after 1145[2]) was the eldest son of Frederick I, Count of Zollern, and became Count of Zollern after his father's death around 1125.
[3] Frederick II supported Lothar of Supplinburg, who was King of Germany, then Holy Roman Emperor, from 1125 to Lothar's death in 1137 against the House of Hohenstaufen, then supported that same house (and the new German King, Conrad III of Germany) after 1138 against the House of Welf.
[3] It was also at this time that the counts of Zollern were able to greatly increase their possessions in terms of both territory and castles in the southwestern parts of today's Germany, expanding to the Rhine, and lower Danube, as well as adding territory in Alsace and by the Neckar.
Land held in feudal tenure was added to these outright possessions to form the ancestral territory of the counts of Zollern.
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