He served as ban of Croatia-Slavonia between 1842 and 1845 during the Croatian national revival and the Illyrian movement in the 1830s and 1840s.
Haller was brought in to carry on Magyarization in Croatia.
In large part due to the July victims incident, in which thirteen protesters were killed in Zagreb, Haller resigned his post and continued his military career in the Austrian Empire.
In 1845 Haller donated 500 forint for building the Croatian National Theatre in Zagreb.
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