Julius Jakob Freiherr von Haynau (14 October 1786 – 14 March 1853) was an Austrian general who suppressed insurrectionary movements in Italy and Hungary in 1848 and later.
While a hugely effective military leader, he also gained renown as an aggressive and ruthless commander.
His soldiers called him the "Habsburg Tiger"; those opponents who suffered from his brutality called him the "Hyena of Brescia" and the "Hangman of Arad".