Francis, Duke of Guise
The factions had engaged in violence even before Charles's accession: in 1560 a group of Huguenot nobles at Amboise had planned to try to abduct King Francis II and arrest the Catholic leaders Francis, Duke of Guise, and his brother Charles, Cardinal of Lorraine. The plot was found out ahead of time, and the Guises were prepared, executing hundreds of Huguenots. This was followed by cases of Protestant iconoclasm and Catholic reprisals.