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In 1590, he returned to Transylvania. He was chosen in the "Assembly of the one hundred" in 1591, then in 1594, as representative of Kronstadt in the Transylvanian Diet (the political and constitutional organ of the principality) and in the "Senate", in 1600. As representative and senator of Kronstadt, the voivodes István Bocskay, Sigismund Rákóczi and those of the Báthory family sent Weiß in several diplomatic missions, including to domnitor Radu Șerban of Wallachia.