 At the same time as his successes in Paris , Meyerbeer , as a Prussian Court Kapellmeister ( Director of Music ) from 1832 , and from 1843 as Prussian General Music Director , was also influential in opera in Berlin and throughout Germany . He was an early supporter of Richard Wagner , enabling the first production of the latter 's opera , Rienzi . He was commissioned to write the patriotic opera Ein Feldlager in Schlesien to celebrate the reopening of the Berlin Royal Opera House in 1844 and wrote music for certain Prussian state occasions . 
