After the 1550 Anabaptist Council of Venice antitrinitarians were persecuted by the Council of Ten and in 1557 Gentile fled with Apollonio Merenda[3][4] to Geneva – already home to Giorgio Biandrata, Nicola Gallo, Giovanni Paolo Alciati and Matteo Gribaldi, and there, in 1558, he aligned with Alciati and Biandrata against Jean Calvin.
The charge was commuted when Gentile agreed to go through the city barefoot in a shirt, the heralds ahead of him, recanting his heresy, and to burn his own writings.
Gentile and Giovanni Paolo Alciati della Motta then followed Biandrata to safety in Pinczòw, the "Sarmatian Athens", 1562–66.
During this period cardinal Giovanni Francesco Commendone succeeded in persuading John II Sigismund to implement the Edict of Parczòw 1564, expelling all the Italian and German Calvinists and Antitrinitarians.
Before any debate could take place, he was arrested, imprisoned, and Théodore de Bèze and Heinrich Bullinger urged the bailiff to take the strictest sentence.