He was born into the gens Hahót as one of the two sons of Arnold II, who served as Palatine of Hungary for a short time in 1242.
During his brother's revolt in 1270, Arnold was still minor, as a result he avoided the impeachment, when the rebellion was crushed by Stephen V in the same year.
[3] Initially, Arnold tried to demand a ransom from the Republic of Venice for his valuable prisoner, but the Commune refused to pay.
[3] Arnold's draud is covered by Ottokar aus der Gaal's Steirische Reimchronik ("Styrian Rhyming Chronicle").
[6] Arnold tried unsuccessfully to regain the castle in the following royal campaign took place in early summer, but was killed in the skirmish.