Question: "Peter und Ännchen" premiered on 29 September 1809 in the theatre of the Ludwigsburg Palace, Franz Carl Hiemer had written the libretti for who, which was a German composer, conductor, pianist, guitarist and critic, and was one of the first significant composers of the Romantic school?
{'answer': 'Carl Maria von Weber', 'supporting_facts': [['Peter und Ännchen', 3], ['Carl Maria von Weber', 0]]}