At the time of their arrival in Europe, the Huns did
not acknowledge a single ruler but had several
power-sharing kings who operated within a ranking
system, with one of their number recognized as
senior king. To avoid overgrazing, the Huns needed
to be dispersed over a wide area and this led to the
formation of a developed power structure. In the
5th century, they began to abandon nomadic
pastoralism and settle in villages. ---- This made
possible a process of political centralization that led
to Ruga becoming sole king of the Huns in 432.