This article presents some manuscript texts that shed new light on the protests against the indulgence campaign connected to the promulgation of Pope John XXIII’s crusade against King Ladislas of Naples in 1412. Thanks to the sources in the University Archives in Vienna, the arrival of indulgence preachers to Prague is set to early April 1412. This new dating suggests that abstrakty a period of negotiations predated the start of the campaign (possibly on 22 May 1412). These negotiations were accompanied by public controversy. Among evidence of it are the first version of Jan Hus’s polemic Contra cruciatam II and a fragment of a sermon possibly from 12 May 1412, both of which are edited in the appendix. Also edited is a statement on indulgences by a Prague Hospitaller John. This text lets emerge a hitherto unnoticed controversial indulgence campaign that ran parallel to that of John XXIII. The sources suggest that the conflict in Prague in 1412 was escalated not so much by a shock caused by the sale of indulgences but rather by a premeditated Wycliffite counter-campaign. and Pavel Soukup.