Bathasar Hubmaier was an ex violently Antisemitic Catholic alongside Erasmus and Zwingli but who rejected his colleagues and repented his entire past by adopting Anabaptist pacifism in April 1525. After his conversion he was arrested but managed to escape long enough to move to ניקאלשפורג in Moravia in 1526 where he became a defender of the Jewish Sabbath through his Silesian students Oswald Glait and Andreas Fischer organizing the Moravian Anabaptists from the remnant of utraquist Bohemian reformers. He was burned at the stake by the Western Church in 1528. His wife was executed with a stone tied around her neck to drown her at the bottom of Danube 3 years later. The Jewish-Sabbath keepers of Hubmaier's students had grown enough to caught the attention of the Catholic Church by June 30, 1533 when Pier Paolo Vergerio, the papal nuncio, wrote from Wiener Neustadt to Rome saying:

"in Moravia ... they have begun to celebrate the Sabbath in the Jewish manner."

Erasmus also commented on them in July of the same year.