Fifth, the Holy Roman Emperor Matthias died without any children to take his place in 1619. He was Catholic. His lands were given to his cousin Ferdinand of Styria. Ferdinand was Matthias's closest male relative. He became Ferdinand II, Holy Roman Emperor. Ferdinand had been educated by the Jesuits, and was a Catholic. He wanted to make Catholicism the only religion again. This made him unpopular in Hussite Bohemia. They rejected Ferdinand and launched the Thirty Years' War. The War can be divided into four major phases: the Bohemian Revolt, the Danish intervention, the Swedish intervention, and the French intervention.