(Franz) Joseph Haydn ( ; ] ; 31 March 173231 May 1809) was an Austrian composer of the Classical period. He was instrumental in the development of chamber music such as the piano trio and his contributions to musical form have earned him the epithets "Father of the Symphony" and "Father of the String Quartet".
Franz Joseph Haydn died in May of 1809
This is definitely correct because it lists the birth and death date after his name in the context. I think this was difficult for the system because they aren't able to distinguish what the dates are for.