On the seventh of October, 1528, late at night, agents of Dukes Wilhelm IV and Ludwig X of Bavaria came to the home in Abensberg of Johann Aventinus, the distinguished historian and pedagogue, and arrested him, “ob evangelium,” as he notes the occasion in his diary.1 The Dukes' action was not unexpected. Aventinus recorded arrests of acquaintances and associates in May and July, also “ob evangelium.” He had been away from home much of the time, possibly to avoid the same fate. He spent the summer in Regensburg2 where the Bavarian government had no jurisdiction, but where prolonged residence, at a time when both Lutheranism and Anabaptism seemed to be making rapid gains there,3 could not but arouse suspicion in Munich. In early October Aventinus returned to Abensberg, his captors at his heels.