Collége de France; it was one of the events that cemented his position over Słowacki in the Polish émigré community. The rivalry between the two Bards for primacy would continue till the ends of lives. In 1841 Słowacki traveled briefly to Frankfurt, but Paris would become his main home till his death. In 1840 and 1841 he wrote two notable dramas: Mazepa, the only of his dramas that was put on stage during his lifetime, and Fantazy, published posthumously, well received by critics. Over the next few years Słowacki wrote and published many works, including Testament mój (My Last Will), in which he described his faith that his works would endure after his death. Between 1841 and 1846, he published Beniowski, considered by some his best lyrical poetry. Starting as a story of a historical figure, it developed into a discussion of the poet's own life and opinions. In 1842 he joined the religious-philosophical group, Koło Sprawy Bożej (Circle of God's Cause), led by Andrzej Towiański. This group included, among others, Mickiewicz. Towiański's influence is credited with a new, mystical current in Słowacki's works, seen in works such as the poem Beniowski and the drama Ksiądz Marek (Father Mark). Słowacki left the Circle a year later, in 1843. In the summers of 1843 and 1844 Słowacki traveled to Pornic, a resort on the Atlantic coast in Brittany. It was there, in 1844, that he wrote Genezis z Ducha (Genesis from the Spirit). This work introduced his philosophical system that would have a visible influence on his works in his last decade. Around 1839 Słowacki put his capital into the Parisian stock market. He was a shrewd investor who earned enough from the investments to dedicate his life to his literary career; he was also able to pay the costs of having his books published. Last years In the late 1840s Słowacki attached himself to a group of like-minded young exiles, determined to return to Poland and win its independence. One of his friends was the pianist and composer Frédéric Chopin. Others included enthusiasts of his work, such as Zygmunt Szczęsny Feliński, Józef Alojzy Reitzenheim and Józef Komierowski. Despite poor health, when he heard about the events of the Spring of Nations, Słowacki traveled with some friends to Poznań, then under Prussian control, hoping to participate in the Wielkopolska Uprising of 1848. He addressed the National Committee (Komitet Narodowy) in Poznań