ABOUT: TMT-DVD-113 - PRAGUE Legend has it that Princess Libussa had a vision in which she saw the Hradschin, the heart of the city of Prague, on the site where the country's capital was later to be founded. Emperor Rudolph ll lived there in the 16th century and it was through his influence that the principles of modern chemistry were discovered, thus laying the foundations of present day science. The secret of alchemy, however, has remained elusive to the present day.