St. George Dragons
Entering the New South Wales Rugby Football League in 1921 , the St George club won 15 premierships including 11 in succession between 1956 and 1966 , a former world record for sporting competitions . 
<triplet> 1921 <subj> New South Wales Rugby Football League <obj> sports season of league or competition <subj> 1921 <obj> point in time <triplet> 1956 <subj> New South Wales Rugby Football League <obj> sports season of league or competition <subj> 1956 <obj> point in time <triplet> 1966 <subj> New South Wales Rugby Football League <obj> sports season of league or competition <subj> 1966 <obj> point in time