Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Defenestrations of Prague:

"

On 23 May 1618, four Catholic lords regent, Count Jaroslav Bořita of Martinice, Count Vilem Slavata of Chlum, Adam II von Sternberg (who was the supreme burgrave), and Matthew Leopold Popel Lobkowitz (who was the grand prior), arrived at the Bohemian Chancellery at 8:30 am. After preparing the meeting hall, members of the dissolved assembly of the three main Protestant estates gathered at 9:00 am, led by Count Thurn, who had been deprived of his post as castellan (burgrave) of Karlštejn Castle by the Emperor. The Protestant lords' agenda was to clarify whether the four regents present were responsible for persuading the Emperor to order the cessation of Protestant church construction on royal lands.[citation needed] According to the Count of Martinice himself: