1. Felix (ˈfeːlɪks), full name Jacob Ludwig Felix Mendelssohn-Bartholdy. 1809–47, German romantic composer. His works include the overtures A Midsummer Night's Dream (1826) and Fingal's Cave (1832), five symphonies, the oratorio Elijah (1846), piano pieces, and songs. He was instrumental in the revival of the music of J. S. Bach in the 19th century
2. his grandfather, Moses (ˈmoːzəs). 1729–86, German Jewish philosopher. His best-known work is Jerusalem (1783), in which he defends Judaism and appeals for religious toleration