had been active since the 1730s House of birth,  Bonn , Bonngasse 20, now the  Beethoven-Haus  museum Beethoven was the grandson of a musician of  Flemish  origin named Lodewijk van Beethoven (1712–1773). [2]  Beethoven was named after his grandfather, as Lodewijk is the  Dutch  cognate of  Ludwig . Beethoven's grandfather was