 The list below includes championships won in single @-@ sport leagues before the school joined an athletic association in all sports in 1919 , championships earned between 1919 and 1993 as members of the Maryland Scholastic Association ( now Maryland Interscholastic Athletic Association ) , and Maryland Public Secondary Schools Athletic Association ( MPSSAA ) district , regional , and state championships won by the Knights since joining the MPSSAA in 1993 . 
