Despite papal support, Otto could not oust his rival Philip until the latter was murdered in a private feud. His rule now undisputed, Otto reneged on his earlier promises and set his sights on reestablishing Imperial power in Italy and claiming even the Kingdom of Sicily. Given the papal interest to keep Germany and Sicily apart, Innocent now supported his ward, King Frederick of Sicily, to resist Otto's advances and restore the Staufen dynasty to the Holy Roman Empire. Frederick was duly elected by the Staufen partisans.