In 1822 , at age 19 , she married Baron Casimir Dudevant ( 1795 â `` 1871 ) , illegitimate son of Jean-Fran Ã ois . In 1822 , at the age of nineteen , she married Baron Casimir Dudevant ( 1795 â `` 1871 ) , illegitimate son of Baron Jean-Fran Ã ois Dudevant .