1. Italian songwriter Francesco Guccini wrote a song "La Primavera di Praga" in dedication to Jan Palach, compared to religious scholar Jan Hus: "Once again Jan Hus is burning alive".

2. One hundred years earlier, the Czech religious reformer Jan Hus had condemned the sale of indulgences.

3. Other groups investigated later included the Spiritual Franciscans, the Hussites (followers of Jan Hus) and the Beguines.

4. 1415 – Religious reformers John Wycliffe and Jan Hus are condemned as heretics at the Council of Constance.