sentence: records most successful horse ( 2 wins ) : flint jack -- 1922 , 1923 leading jockey ( 5 wins ) : lester piggott -- gladness ( 1958 ) , primera ( 1959 ) , die hard ( 1961 ) , tintagel ii ( 1970 ) , jupiter island ( 1983 ) leading trainer ( 5 wins ) : tom dawson -- godfrey ( 1844 ) , mark tapley ( 1850 ) , pax ( 1860 ) , makeshift ( 1862 ) , mandrake ( 1867 ) winners since 1978 weights given in stone and pound .