He journeyed to Rome a year later for the imperial coronation of Conrad by Pope John XIX on 26 March 1027;[1] at a synod at the Lateran he negotiated a decision of the precedence of the archdiocese of Milan over that of Ravenna.
[1][4] He subsequently joined an imperial military expedition into the Kingdom of Arles, which Conrad inherited upon the death in 1032 of Rudolph III of Burgundy, but which was contested by Odo.
Aribert created enemies among the lower nobility, against whom he perpetrated the worst acts of violence, and with the metropolitan of Ravenna, whose episcopal rights, along with those of the smaller sees, he ignored.
A revolt soon engulfed northern Italy and, at Aribert's request, Conrad's son, the Emperor Henry III, travelled south of the Alps in the winter of 1036/37, to quell it.
The Emperor found himself unable to take Milan by siege and proceeded to Rome, where his diplomatic skills succeeded in isolating Aribert from his erstwhile allies, notably through his famous decree of 28 May 1037, securing the tenancy of lesser vassals, both imperial and ecclesiastical.