Jan Hus day (July 6)

Public holiday on July 6 called Jan Hus Day in the Czech Republic. 
This state holiday commemorates the martyrdom of Jan Hus.
Jan Hus was a Czech priest, religious reformer and university professor who is best known for his advocacy of church reforms during the early 15th century. 
Jan Hus Day is celebrated annually on 6 July in memory of his death.
His death spiked the Hussite wars, in which his followers fought against the Roman Catholic Church.