The Saxon colonists in this state welcomed the Reformation, formally recognizing the Augsburg Confession in a synod of 1572.

Here also the Unitarians attained their greatest strength, being recruited partly from those expelled from Poland.

They drew their inspiration not merely from Sozini, but from a variety of sources, for the doctrine appeared simultaneously among certain Anabaptist and Spiritualist sects.

Toleration was granted them on the same terms as other Christians.

The name "Unitarian" first appears in a decree of the Transylvania Diet of the year 1600.