Likely related to tax matters was an unsuccessful attempt on the life of the king, made on 5 May 1523. The identity of the would-be assassin - who shot the ruler while he was strolling in the evening around the cloisters of the Wawel castle - and his potential supporters was never established. Unclear motives remained after the assassination attempt. Three weeks before the event, Sigismund I introduced a new edict that was very unfavourable and somewhat hostile to the high-ranking nobles and their interests.