New England Patriots (2001-2019)

Six Super Bowl titles in 18 years under Brady and Belichick represent the most dominant dynasty in NFL salary-cap history. The Patriots' .764 playoff win percentage is 30% higher than the average championship team since 2000. Compared to #3 Real Madrid's five consecutive Champions League titles, New England's sustained excellence under strict roster limitations makes their run statistically more improbable in modern sports.