The
Defenestration of 1618 was in fact the "Second Defenestration of Prague".
The First Defenestration occurred 200 years earlier, in June 1419. The Hussites were rapidly gaining popularity of the time, and King Wenceslas IV, unable to keep control, had many of their leaders taken prisoner. During one of the trials, the citizens of Prague stormed the New Town Hall and threw the jury from the windows.
Following Wenceslas' death later that year, the Holy Roman Emperor Sigismund started the Hussite Wars in retaliation.