An attempt by Queen Sibongile Dlamini-Zulu to have the late King Goodwill Zwelithini's customary marriages declared invalid has failed in the Pietermaritzburg High Court. Judge Isaac Madondo on Wednesday dismissed a request by Dlamini-Zulu through lawyer Nigel Redman to bring a late application to amend court papers to declare the subsequent marriages between Zwelithini and his customary wives invalid.