Original: Backlash was a professional wrestling pay-per-view ( PPV ) event produced every April ( with the exception of 2005 ) by professional wrestling promotion World Wrestling Entertainment ( WWE ) . The event was created in 1999 , with its inaugural event produced as an In Your House event in April of that year .
Simplified: Backlash is an yearly professional wrestling pay-per-view event made by World Wrestling Entertainment , which started in 1999 and is held in April ( but 2005 was not ) .