Frederick IV of Toggenburg

Frederick IV (before 1286 – 15 November 1315) ruled as count of Toggenburg from 1309. In 1313 he bought Wildenburg Castle near Baar. He married Ita von Homberg, who bore him sons Frederick V and Diethelm V.

In November 1315 he rode with Duke Leopold I of Habsburg against the Swiss Confederates and was killed on 15 November at the Battle of Morgarten, when men of Schwyz ambushed Leopold's column beside Lake Ägeri.