 Louis I of Anjou died on 10 September 1384, enabling his rival, CharlesIII of Naples, to stabilize his rule in Southern Italy during the next months.The consolidation of CharlesIII's position in Naples also contributed to the formation of a party of noblemen who supported his claim to Hungary.John Horvat, Ban of Macsó (now Mačva in Serbia), and his brother, Paul, Bishop of Zagreb, were the leading figures of their movement.