 Complete the following phrase:  In addition to its original merchant functions the Main Square witnessed many historical events, and it was used to stage public executions of prisoners held in the citys Town Hall. It was a place of regal ceremonies as part of the Royal Road Droga Królewska, frequented by diplomats and dignitaries traveling to Wawel Castle. In 1364 King Casimir held the Pan-European Congress of Kraków there. On 10 April 1525, Albert I, Duke of Prussia paid the 