Adalbert (bishop of Passau)
file:BistumswappenPassau.JPG|thumb|right|Bistumswappen of Passau.Adalbert was the 17th Bishop of Passau from 946 to 970.
In his reign was the fateful battle on the Lechfeld of 955, in which Emperor Otto I defeated the Hungarians. For the Diocese of Passau, this meant that it was now again able to exert its effectiveness in the land below the Enns.