One of the king's most substantial achievements was in the cultural sphere; he became a notable patron of the arts. Władysław was a connoisseur of the arts, in particular, theater and music. He spoke several languages, enjoyed reading historical literature and poetry. He collected paintings and created a notable gallery of paintings in the Warsaw castle. Władysław assembled an important collection of Italian and Flemish Baroque paintings, much of which were lost in the wars after his death. He sponsored many musicians and in 1637 created the first amphitheater in the palace, the first theater in Poland, where during his reign dozens of operas and ballets were performed. He is credited with bringing the very genre of opera to Poland. Władysław's attention to theater contributed to the spread of this art form in Poland. He was also interested in poetry, as well as in cartography and historical and scientific works; he corresponded with Galileo.