local priest on Hven to include the exorcism in the baptismal ritual. Among the accusations raised against Tycho were his failure to adequately maintain the royal chapel at Roskilde, and his harshness and exploitation of the Hven peasantry. Tycho became even more inclined to leave when a mob of commoners, possibly incited by his enemies at court, rioted in front of his house in Copenhagen. Tycho left Hven in 1597, bringing some of his instruments with him to Copenhagen, and entrusting others to a caretaker on the island. Shortly before leaving, he completed his star catalogue giving the positions of 1,000 stars. After some unsuccessful attempts at influencing the king to let him return; including showcasing his instruments on the wall of the city, he finally acquiesced to exile, but he wrote his most famous poem Elegy to Dania in which he chided Denmark for not appreciating his genius. The instruments he had used in Uraniborg and Stjerneborg were depicted and described in detail in his star catalogue Astronomiae instauratae mechanica or Instruments for the restoration of astronomy, first published in 1598. The King sent two envoys to Hven to describe the instruments left behind by Tycho. Unversed in astronomy, the envoys reported to the king that the large mechanical contraptions such as his large quadrant and sextant were "useless and even harmful". From 1597 to 1598, he spent a year at the castle of his friend Heinrich Rantzau in Wandesburg outside Hamburg, and then they moved for a while to Wittenberg, where they stayed in the former home of Philip Melanchthon. In 1599, he obtained the sponsorship of Rudolf II, Holy Roman Emperor and moved to Prague, as Imperial Court Astronomer. Tycho built a new observatory in a castle in Benátky nad Jizerou, 50 km from Prague, and worked there for one year. The emperor then brought him back to Prague, where he stayed until his death. At the imperial court even Tycho's wife and children were treated like nobility, which they had never been at the Danish court. Tycho received financial support from several nobles in addition to the emperor, including Oldrich Desiderius Pruskowsky von Pruskow, to whom he dedicated his famous Mechanica. In return for their support, Tycho's duties included preparing astrological charts and predictions for his patrons at events such as births, weather forecasting, and astrological interpretations of significant astronomical events, such as the supernova of