Euin, the first Lombard Duke of Tridentum (Trent), had been at the head of the army loyal to Authari that in about 589 went into the territory in Istria of the duke of Friuli, and in 591 he had been sent by Agilulf to make peace with the Franks, his neighbors, .

After Euin's death in January 595, Agilulf installs Gaidoald, who is a Catholic, rather than an Arian Christian.

After the truce with Guy is signed, Arnulf of Germany endeavors to invade Italy through Friuli.

Berengar, in order to prevent a war, sends dignitaries (leading men) ahead to meet Arnulf.

He himself then has a meeting, sometime between early November and Christmas, at Trent.

He is allowed to keep Italy, as Arnulf's vassal, but the curtes of Navus and Sagus are taken from him.

Arnulf allows his army to return to Germany, but he himself celebrates Christmas in Friuli, at Karnberg.

Henry II, responding to calls for aid from Italian bishops, leads an invasion into Italy against Arduin in 1004, gathering his troops at Augsburg and marching through the Brenner Pass to Trento in Italy.

After initial military successes, much of the Italian clergy and some noble families swear allegiance to Henry II, including Arbishop Arnulf II of Milan.

Emperor Charles, having long recognized the need for a thoroughgoing reform of the Roman Catholic Church, finally persuades a reluctant Pope Paul III to summon the Council of Trent in 1545 as a response to the theological and ecclesiological challenges of the Protestant Reformation.

Certain church leaders have long perceived the need for such a council, but initial attempts to organize it have met opposition from King Francis of France, who fears it will strengthen his foe, Charles, and by the papacy itself, which fears a revival of conciliarism.

Paul appoints English Cardinal Reginald Pole one of his legates to the council.

Neither the Protestant nor Orthodox churches recognize Trent, the Roman Catholic Church’s nineteenth ecumenical council, as such.

Considered one of the most important councils in the history of the Catholic Church, it is a major first step in the Counter-Reformation or, as some Roman Catholic scholars call it, the “Catholic Reformation.”

A few Garibaldian volunteers operating in the Trento area are the sole Italians to achieve some moderate success.

Garibaldi's "Hunters of the Alps" defeats the Austrians at the Battle of Bezzecca, on July 21, conquer the lower part of Trentino, and move towards Trento.