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.
[2]) Gottschalk maintained that the abbot subsequently compelled him to receive the tonsure and take the monastic vows.
[4] With the support of Louis, Hetto built the Church of Saint Castor just outside of Confluentes.