sentences:  In the same year when they attained their majority, both princes attended the wedding ceremony of King Sigismund I the Old with Bona Sforza in Kraków.As Polish vassals, during 1519-1520 Janusz III and his brother participated in the Polish-Teutonic War sending auxiliary troops to the Polish King.Despite being the co-ruler of their domains, Janusz III didn't participate in the government until Stanisław's death on 8 August 1524, when he finally began his sole government.