Louis the Pious confirmed to Hetto the privilege of immunity from the saecular courts. This had been previously granted to Bishop
Wermad who served before Trier was made an archiepiscopal see. In 829, Hetto was among a number of bishops who participated in the
Synod of Mainz to hear the case of
Gottschalk of Orbais, monk of the
monastery of Fulda, against
Rabanus Maurus, his abbot. Gottschalk's father had placed him at the abbey as a child oblate along with a gift of land. (The
Tenth Council of Toledo of 656 forbade their acceptance before the age of ten and granted them free permission to leave the monastery, if they wished, when they reached the age of puberty.) Gottschalk maintained that the abbot subsequently compelled him to receive the tonsure and take the monastic vows. He sought his freedom and the return of his land, arguing that his oblation was invalid under Saxon law as there were no Saxon witnesses. Several of the bishops at the council held Saxon sees. The council held in favor of the monk. In 831, Hetto was a co-consecrator of
Ansgar as bishop for the northern missions. With the support of Louis, Hetto built the
Church of Saint Castor just outside of
Confluentes. In 836, he translated the relics of
St. Castor from the Paulinuskirchen in
Karden to the church. In 846, Hetto gifted the hamlet of
Scindalasheim to Abbot Marcuardus of
Prüm Abbey. He was succeeded by his nephew
Theotgaud. == Works ==