Rugby boasts a rich history filled with legendary players whose skill, leadership, and impact on the game have transcended generations.  Choosing the "most successful" is subjective, but here are a few icons who have undeniably left their mark on the sport:

1. Richie McCaw (New Zealand):  Widely considered the greatest rugby player ever, McCaw captained the All Blacks to two consecutive Rugby World Cup victories (2011 & 2015).  His leadership, tactical mastery, and relentless work ethic were instrumental in the All Blacks' dominance during his era.

2. Jonah Lomu (New Zealand):  A true game-changer, Lomu revolutionized the wing position with his phenomenal pace, power, and offloading skills.  His size and agility created a nightmare for opposing defenses, and his iconic try against England in the 1995 Rugby World Cup remains etched in rugby folklore.

3. Dan Carter (New Zealand):  Arguably the greatest fly-half of all time, Carter's kicking skills were unmatched.  His tactical mind, pinpoint accuracy, and ability to control the game made him a maestro on the pitch.  He holds the record for most test points scored, a testament to his consistent brilliance.

4. Brian O'Driscoll (Ireland):  One of the most decorated centers in rugby history, O'Driscoll possessed exceptional attacking flair and a ferocious defense.  He captained Ireland for many years and remains the country's highest try scorer.  His longevity, consistency, and impact on Irish rugby solidify his place among the legends.

5. Jonny Wilkinson (England):  A true World Cup hero, Wilkinson's drop goal in the dying seconds of the 2003 final secured England's only World Cup victory.  He was a world-class kicker and a tactically astute player who could single-handedly influence the outcome of a match.

Beyond the Statistics:  This list just scratches the surface. Legends like Wales' Gareth Edwards, South Africa's Bryan Habana, and Australia's John Eales all deserve a mention. Their impact can't be solely measured by trophies or statistics. Their leadership, sportsmanship, and the way they inspired future generations are equally important contributions to the sport.