One year later, with his cousin Henry VII with a Scar -Louis's son-, Rupert joined to the Emperor Charles IV's trip to be crowned King of Arles.

Rupert visited then another French cities, including Avignon, where he obtained from the Pope Urban V the annulment of the excommunication over his late father.

Thanks to the pressure of Louis, Rupert signed an agreement with his younger brothers on 2 December 1372, under which they accepted not divided the Duchy of Legnica between them for the next ten years.

The agreement was extended in subsequent years and allowed Rupert to exercise full control over Legnica at expense of his younger brothers, who, although they are co-rulers, none of them had any real power.

The successive deaths of Louis I the Fair (6 December 1398) and his son Henry VII (11 July 1399) left Rupert as the Head of the Silesian Legnica-Brieg branch, who allowed him to act as a mediator in the disputes of his Silesian relatives (for example in 1399 between the Dukes of Opole and the Bishop of Lubusz, Jan Borschnitzem, and in 1400, with the sons of Henry VII, who wanted to share their dominions).